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[MANEUVERS, UNION CAVALRY, WINTER QUARTERS]. BRADY ALBUM, P. 127, 1861-65. FORMERLY ATTRIBUTED TO MATHEW B. BRADY.

[Maneuvers, Union Cavalry, Winter Quarters]. Brady album, p. 127, 1861-65. Creator: Unknown. [Maneuvers, Union Cavalry, Winter Quarters]. Brady album, p. 127, 1861-65. Formerly attributed to Mathew B. Brady. (KEYSTONE/HERITAGE IMAGES/HERITAGE ART)

[MANEUVERS, WINTER QUARTERS]. BRADY ALBUM, P. 129, 1861-65. FORMERLY ATTRIBUTED TO MATHEW B. BRADY.

[Maneuvers, Winter Quarters]. Brady album, p. 129, 1861-65. Creator: Unknown. [Maneuvers, Winter Quarters]. Brady album, p. 129, 1861-65. Formerly attributed to Mathew B. Brady. (KEYSTONE/HERITAGE IMAGES/HERITAGE ART)

ALBUM OF 67 PHOTOGRAPHIC STUDIES OF SELF-DEFENSE MANEUVERS, CA. 1895. A MANUAL OF CHOKE HOLDS, BODY SLAMS, KICKS, CHOPS, AND ARM TWISTS. EACH TWO-PICTURE SPREAD DEPICTS THE MOMENT OF CONFRONTATION BETWEEN TWO MEN FOLLOWED BY THE APPROPRIATE MANEUVER.

Album of 67 Photographic Studies of Self-Defense Maneuvers, ca. 1895. Creator: Unknown. Album of 67 Photographic Studies of Self-Defense Maneuvers, ca. 1895. A manual of choke holds, body slams, kicks, chops, and arm twists. Each two-picture spread depicts the moment of confrontation between two men followed by the appropriate maneuver. (KEYSTONE/HERITAGE IMAGES/HERITAGE ART)

[CAVALRY MANEUVERS, CAMP DE CHÂLONS], 1857.

[Cavalry Maneuvers, Camp de Châlons], 1857. Creator: Gustave Le Gray. (KEYSTONE/HERITAGE IMAGES/HERITAGE ART)

BWTEX EXERCISE, POLICE AND BUNDESWEHR REHEARSE THE FIGHT AGAINST TERRORISTS TOGETHER. 2, 500 PEOPLE TOOK PART IN THE LARGEST ANTI-TERROR EXERCISE IN BADEN-WUERTTEMBERG. A FICTITIOUS ATTACK IS SIMULATED, SYMBOL PHOTO, STETTEN AM KALTEN MARKT, BADEN-WUERTTE

BWTEX-uebung, Polizei und Bundeswehr proben gemeinsam den Kampf gegen Terroristen. Bei der groessten Anti-Terror-uebung in Baden-Wuerttemberg beteiligten sich 2500 Menschen. Simuliert wird ein fiktiver Anschlag, Symbolfoto, Stetten am kalten Markt, Baden-Wuerttemberg, Deutschland BWTEX exercise, police and Bundeswehr rehearse the fight against terrorists together. 2, 500 people took part in the largest anti-terror exercise in Baden-Wuerttemberg. A fictitious attack is simulated, symbol photo, Stetten am kalten Markt, Baden-Wuerttemberg, Germany (KEYSTONE/imageBROKER/ARNULF HETTRICH)

GROSSBRITANNIEN MARINE GASMASKEN

Am 31. Juli 1939 ziehen 12'000 Marine-Reservisten in die Kasernen bei Chatham, Portsmouth und Devenport ein, um an den Flottenmanoevern im August und September teilzunehmen. Dabei fassen die Soldaten auch ihre Ausruestung gegen einen Gasangriff. (KEYSTONE/IBA-ARCHIV/Str)

YOUNG SAILOR WEARING SUNGLASSES MANEUVERING WITH WINCH IN SAILBOAT

Young sailor wearing sunglasses maneuvering with winch in sailboat (KEYSTONE/WESTEND61/GALA MARTà­NEZ Là³PEZ)

HAND OF SAILOR MANEUVERING WITH MAINSAIL IN SAILBOAT

Hand of sailor maneuvering with mainsail in sailboat (KEYSTONE/WESTEND61/GALA MARTà­NEZ Là³PEZ)

MAN MANEUVERING WITH WINCH WHILE WOMAN DRIVING SAILBOAT IN SEA

Man maneuvering with winch while woman driving sailboat in sea (KEYSTONE/WESTEND61/GALA MARTà­NEZ Là³PEZ)

MAN MANEUVERING WITH WINCH WHILE WOMAN DRIVING SAILBOAT AGAINST SKY

Man maneuvering with winch while woman driving sailboat against sky (KEYSTONE/WESTEND61/GALA MARTà­NEZ Là³PEZ)

SAILOR MANEUVERING SETTING THE MAINSAIL IN SAILBOAT AGAINST SKY

Sailor maneuvering setting the mainsail in sailboat against sky (KEYSTONE/WESTEND61/GALA MARTà­NEZ Là³PEZ)

MALE SAILOR MANEUVERING WITH WINCH IN SAILBOAT AGAINST SKY

Male sailor maneuvering with winch in sailboat against sky (KEYSTONE/WESTEND61/GALA MARTà­NEZ Là³PEZ)

MARINE SUPPLIER WITH TUGS

Marineversorger mit Schleppern Marine supplier with tugs (KEYSTONE/mauritius images/SEBASTIAN ALMES)

NORWEGEN NATO MANOEVER UEBUNG

epa07131248 NATO Troops in landing craft with a USMC Osprey V-22 aircraft during the NATO-led military exercise Trident Juncture (TRJE18) on 'Distinguised Visitors Day,' in Trondheim, Norway, 30 October 2018. According to reports, some 50,000 participants from over 30 nations are expected to take part in the NATO-led military exercise in Norway from 25 October to 23 November 2018. EPA/Gorm Kallestad NORWAY OUT

NORWEGEN NATO MANOEVER UEBUNG

epa07131199 Explosions in the water during the NATO-led military exercise Trident Juncture (TRJE18) on 'Distinguised Visitors Day,' in Trondheim, Norway, 30 October 2018. According to reports, some 50,000 participants from over 30 nations are expected to take part in the NATO-led military exercise in Norway from 25 October to 23 November 2018. EPA/Gorm Kallestad NORWAY OUT

NORWEGEN NATO MANOEVER UEBUNG

NATO Secretary General Jens Stoltenberg visits the NATO-led military exercise Trident Juncture on Distinguished Visitors Day in Trondheim, Norway, Tuesday Oct. 30, 2018. (Gorm Kallestad/NTB Scanpix via AP)

NORWEGEN NATO MANOEVER UEBUNG

NATO Secretary General Jens Stoltenberg arrives at the Danish support ship HDMS Esbern Snare during his visit to the NATO exercise Trident Juncture 2018, in Trondheim, Norway, Monday, Oct. 29. 2018. (Gorm Kallestad/NTB scanpix via AP)

NORWEGEN NATO MANOEVER UEBUNG

epa07129697 A Norwegian Motor Topedo Boat (MTB) KNM Skudd takes part in the NATO-led military exercise Trident Juncture 2018 (TRJE18), off the coast of Trondelag, Norway, 29 October 2018. The TRJE18 runs from 25 October to 23 November 2018. EPA/GORM KALLESTAD NORWAY OUT

NORWEGEN NATO MANOEVER UEBUNG

epa07124354 Norway's Prime Minister Erna Solberg (L) rides on a Leopard 2 battle tank, during the NATO military exercise Trident Juncture, in the Roeros area, mid Norway, 27 October 2018. EPA/HEIKO JUNGE NORWAY OUT

NORWEGEN NATO MANOEVER UEBUNG

epa07124353 Norway's Prime Minister Erna Solberg (L) rides on a Leopard 2 battle tank, during the NATO military exercise Trident Juncture, in the Roeros area, mid Norway, 27 October 2018. EPA/HEIKO JUNGE NORWAY OUT

NORWEGEN NATO MANOEVER UEBUNG

epa07124272 Swedish soldiers taking part in NATO exercise Trident Juncture, in the Roeros area, mid Norway, 27 October 2018. EPA/HEIKO JUNGE NORWAY OUT

NORWEGEN NATO MANOEVER UEBUNG

epa07119135 Norwegian Chief of Defence, Admiral Haakon Bruun-Hanssen (L) and Commander of..NATOs Joint Force Command Naples, Admiral James G. Foggo, attend a joint press meeting to brief on the Trident Juncture 18 excercise in Oslo, 25 October 2018. According to reports, some 50,000 participants from over 30 nations are expected to take part in the NATO-led military exercise in Norway from 25 October to 23 November 2018. EPA/Gorm Kallestad NORWAY OUT

GRAFIK NATO-MANOEVER TRIDENT JUNCTURE

GRAFIK --- Karte Skandinavien, Uebungsgebiet, Factbox (90 x 96mm hoch) vom Dienstag, 23. Oktober 2018 (KEYSTONE/Gerhard Riezler)

NORWEGEN NATO MANOEVER UEBUNG

epa07103927 Dutch soldiers depart from Eindhoven Airport in Eindhoven, Netherlands, 19 October 2018. The soldiers will participate in the NATO (North Atlantic Treaty Organization) exercise Trident Juncture, which will take place in Norway from 25 October to 23 November 2018. EPA/REMKO DE WAAL

NORWEGEN NATO MANOEVER UEBUNG

epa07103928 Dutch soldiers depart from Eindhoven Airport in Eindhoven, Netherlands, 19 October 2018. The soldiers will participate in the NATO (North Atlantic Treaty Organization) exercise Trident Juncture, which will take place in Norway from 25 October to 23 November 2018. EPA/REMKO DE WAAL

NORWEGEN NATO MANOEVER UEBUNG

epa07103926 Dutch soldiers depart from Eindhoven Airport in Eindhoven, Netherlands, 19 October 2018. The soldiers will participate in the NATO (North Atlantic Treaty Organization) exercise Trident Juncture, which will take place in Norway from 25 October to 23 November 2018. EPA/REMKO DE WAAL

NORWEGEN NATO MANOEVER UEBUNG

epa07089005 NATO Secretary General, Jens Stoltenberg (C), talking with Captain Nicholas J. Dienna on the bridge of the US Nimitz-class aircraft carrier USS Harry S. Truman in The North Sea, on 12 October 2018. The aircraft carrier is on its way to the Norwegian Coast to participate in the NATO exercise Trident Juncture. EPA/Johan Falnes NORWAY OUT

KOREA SUED KONFLIKT KOREA NORD MANOEVER

A U.S. Air Force F-16 fighter jet takes part in a joint aerial drills called Vigilant Ace between U.S and South Korea, at the Osan Air Base in Pyeongtaek, South Korea, Wednesday, Dec. 6, 2017. The five-day drill is meant to improve the allies' wartime capabilities and preparedness, South Korea's defense ministry said. (Kim Hong-Ji/Pool Photo via AP)

KOREA SUED KONFLIKT KOREA NORD MANOEVER

U.S. Air Force F-16 fighter jets take part in a joint aerial drills called Vigilant Ace between U.S and South Korea, at the Osan Air Base in Pyeongtaek, South Korea, Wednesday, Dec. 6, 2017. The five-day drill is meant to improve the allies' wartime capabilities and preparedness, South Korea's defense ministry said. (Kim Hong-Ji/Pool Photo via AP)

KOREA SUED KONFLIKT KOREA NORD MANOEVER

A U.S. soldier takes part in a joint aerial drills called Vigilant Ace between U.S and South Korea, at the Osan Air Base in Pyeongtaek, South Korea, Wednesday, Dec. 6, 2017. The five-day drill is meant to improve the allies' wartime capabilities and preparedness, South Korea's defense ministry said. (Kim Hong-Ji/Pool Photo via AP)

KOREA SUED KONFLIKT KOREA NORD MANOEVER

A U.S. soldier takes part in a joint aerial drills called Vigilant Ace between U.S and South Korea, at the Osan Air Base in Pyeongtaek, South Korea, Wednesday, Dec. 6, 2017. The five-day drill is meant to improve the allies' wartime capabilities and preparedness, South Korea's defense ministry said. (Kim Hong-Ji/Pool Photo via AP)

KOREA SUED KONFLIKT KOREA NORD MANOEVER

A U.S. soldier takes part in a joint aerial drills called Vigilant Ace between U.S and South Korea, at the Osan Air Base in Pyeongtaek, South Korea, Wednesday, Dec. 6, 2017. The five-day drill is meant to improve the allies' wartime capabilities and preparedness, South Korea's defense ministry said. (Kim Hong-Ji/Pool Photo via AP)

KOREA SUED KONFLIKT KOREA NORD MANOEVER

U.S. Air Force F-16 fighter jets prepare to take off at the Osan U.S. Air Base in Pyeongtaek, South Korea, Monday, Dec. 4, 2017. Hundreds of aircrafts including two dozen stealth jets began training Monday as the United States and South Korea launched their combined air force exercise. (AP Photo/Ahn Young-joon)

KOREA SUED KONFLIKT KOREA NORD MANOEVER

A U.S. Air Force EA-18G Growler fighter jet prepares to land at the Osan U.S. Air Base in Pyeongtaek, South Korea, Monday, Dec. 4, 2017. Hundreds of aircrafts including two dozen stealth jets began training Monday as the United States and South Korea launched their combined air force exercise. (AP Photo/Ahn Young-joon)

KOREA SUED KONFLIKT KOREA NORD MANOEVER

A U.S. Air Force F-22 Raptor takes off from a South Korean air base in Gwangju, South Korea, Monday, Dec. 4, 2017. The United States and South Korea have started their biggest-ever joint air force exercise with hundreds of aircrafts including two dozen stealth jets. (Yonhap via AP)

KOREA SUED KONFLIKT KOREA NORD MANOEVER

A man walks by a TV screen showing a local news program reporting about North Korea's missile launch with an images of U.S. President Donald Trump and South Korean President Moon Jae-in at the Seoul Railway Station in Seoul, South Korea, Friday, Dec. 1, 2017. Two days after North Korea test-launched its most powerful missile to date, a clearer picture is emerging of Pyongyang's impressive technological achievement âÄ” and what still remains before it can legitimately threaten the continental United States. South Korean President Moon shared his country's assessment with President Trump in a telephone conversation Thursday night. The leaders reaffirmed their commitment to strengthen pressure and sanctions on Pyongyang to discourage its nuclear ambitions, Seoul's presidential office said Friday.(AP Photo/Lee Jin-man)

RUSSLAND MILITAER MANOEVER RUS CHN

PRIMORYE TERRITORY, RUSSIA - SEPTEMBER 21, 2017: Chinese People's Liberation Army Navy naval infantry soldiers take part in a joint drill by counter-terrorism units at Gornostai on Russia's Pacific coast during the 2nd phase of the joint Russian-Chinese military exercise in Far East, Naval Interaction 2017. Yuri Smityuk/TASS (KEYSTONE/TASS/Yuri Smityuk)

RUSSLAND MILITAER MANOEVER RUS CHN

PRIMORYE TERRITORY, RUSSIA - SEPTEMBER 21, 2017: Chinese People's Liberation Army Navy naval infantry soldiers take part in a joint drill by counter-terrorism units at Gornostai on Russia's Pacific coast during the 2nd phase of the joint Russian-Chinese military exercise in Far East, Naval Interaction 2017. Yuri Smityuk/TASS (KEYSTONE/TASS/Yuri Smityuk)

RUSSLAND MILITAER MANOEVER RUS CHN

PRIMORYE TERRITORY, RUSSIA - SEPTEMBER 21, 2017: Chinese People's Liberation Army Navy naval infantry soldiers take part in a joint drill by counter-terrorism units at Gornostai on Russia's Pacific coast during the 2nd phase of the joint Russian-Chinese military exercise in Far East, Naval Interaction 2017. Yuri Smityuk/TASS (KEYSTONE/TASS/Yuri Smityuk)

RUSSLAND MILITAER MANOEVER RUS CHN

PRIMORYE TERRITORY, RUSSIA - SEPTEMBER 21, 2017: Chinese People's Liberation Army Navy naval infantry soldiers take part in a joint drill by counter-terrorism units at Gornostai on Russia's Pacific coast during the 2nd phase of the joint Russian-Chinese military exercise in Far East, Naval Interaction 2017. Yuri Smityuk/TASS (KEYSTONE/TASS/Yuri Smityuk)

RUSSLAND MILITAER MANOEVER RUS CHN

PRIMORYE TERRITORY, RUSSIA - SEPTEMBER 21, 2017: A joint drill by counter-terrorism units at Gornostai on Russia's Pacific coast during the 2nd phase of the joint Russian-Chinese military exercise in Far East, Naval Interaction 2017. Yuri Smityuk/TASS (KEYSTONE/TASS/Yuri Smityuk)

RUSSLAND MILITAER MANOEVER RUS CHN

3197019 09/21/2017 Russian marines during a joint Russian-Chinese training session at the Gornostai training ground in the Primorye Territory. The training is part of the land stage of the Maritime Cooperation 2017 military exercise. Vitaliy Ankov/Sputnik (KEYSTONE/SPUTNIK/Vitaliy Ankov)

WEISSRUSSLAND MILITAER MANOEVER SAPAD 2017

epa06215205 Shells explode during the joint Russia-Belarus strategic military exercises Zapad 2017 near Borysow in Belarus, 20 September 2017. EPA/TATIANA ZENKOVICH

WEISSRUSSLAND MILITAER MANOEVER SAPAD 2017

epa06214941 Fighters jets in action during the 'Zapad 2017' joint Russian-Belarusian military drill 'Zapad 2017' near the town of Borysow in Belarus, 20 September 2017. EPA/LESZEK SZYMANSKI POLAND OUT

WEISSRUSSLAND MILITAER MANOEVER SAPAD 2017

An air defense missile flies to hit a mock target during military exercises, near the Volka village, 200 kilometers (125 miles) south-west of Minsk, Belarus, Tuesday, Sept. 19, 2017. The Zapad (West) 2017 military drills held jointly by Russian and Belarusian militaries at several firing ranges in both countries have rattled Russia's neighbors. (Sergei Gapon/Pool Photo via AP)

WEISSRUSSLAND MILITAER MANOEVER SAPAD 2017

An air defense missile hits a mock target during military exercises, near the Volka village, 200 kilometers (125 miles) south-west of Minsk, Belarus, Tuesday, Sept. 19, 2017. The Zapad (West) 2017 military drills held jointly by Russian and Belarusian militaries at several firing ranges in both countries have rattled Russia's neigbors. (Sergei Gapon/Pool Photo via AP)

WEISSRUSSLAND MILITAER MANOEVER SAPAD 2017

An air defense missile hits a mock target during military exercises, near the Volka village, 200 kilometers (125 miles) south-west of Minsk, Belarus, Tuesday, Sept. 19, 2017. The Zapad (West) 2017 military drills held jointly by Russian and Belarusian militaries at several firing ranges in both countries have rattled Russia's neighbors. (AP Photo/Sergei Grits, Pool)

WEISSRUSSLAND MILITAER MANOEVER SAPAD 2017

Belarusian military jets fly during military exercises, near the Volka village, 200 kilometers (125 miles) south-west of Minsk, Belarus, Tuesday, Sept. 19, 2017. The Zapad (West) 2017 military drills held jointly by Russian and Belarusian militaries at several firing ranges in both countries have rattled Russia's neighbors. (AP Photo/Sergei Grits, Pool)

CHINA MILITARY PARADE

In this photo released by China's Xinhua News Agency, Chinese People's Liberation Army (PLA) troops march in formation Sunday, July 30, 2017, as they arrive for a military parade to commemorate the 90th anniversary of the founding of the PLA on Aug. 1 at Zhurihe training base in north China's Inner Mongolia Autonomous Region. (Fei Maohua/Xinhua via AP)

SOLDIERS DURING A MARCH, 1939-1945

Waehrend eines Marschs machen deutsche Soldaten an einem See Rast. During a march, german soldiers make a rest by a lake. (KEYSTONE/SUEDDEUTSCHE ZEITUNG PHOTO/GERT MAEHLER)

TRUMP AIR FORCE ONE

A military transport plane is seen below and on the starboard side from Air Force One while in flight from Palm Beach International Airport, Fla., to Andrews Air Force Base, Md., Sunday, April 9, 2017. Trump was in Florida meeting with Chinese President Xi Jinping. (AP Photo/Alex Brandon)

ZWEITER WELTKRIEG USA MANOEVER AMERIKANISCHER PANZER M4 SHERMAN

Militär / Länder / USA / Zweiter Weltkrieg...Desert Center, California Training Center: Sherman M4 Panzer während eines Wüstenmanövers...Foto, Oktober 1942. (KEYSTONE/akg-images)

KOREA NORD KONFLIKT RAKETENPROGRAMM

epa05834127 An undated photo made available by the North Korean Central News Agency (KCNA), the state news agency of North Korea, on 07 March 2017, shows four projectiles during a ballistic rocket launching drill of Hwasong artillery units of the Strategic Force of the Korean People's Army (KPA) at an undisclosed location, North Korea. North Korean leader Kim Jong-un, supreme commander of the KPA, was said to supervise the drill. EPA/KCNA EDITORIAL USE ONLY

NEPAL ARMY DAY PREPARATIONS

epa05796176 A line of Nepalese army personnel wearing ceremonial dress stands before trees during a rehearsal for the annual Army Day in Kathmandu, Nepal, 16 February 2017. Nepal's Army Day falls on upcoming 24 February, which coincides with the Hindu festival of Mahashivratri. The Nepalese army is active since 1744 and it has a size of about 95,000 infantry army and air service members. EPA/NARENDRA SHRESTHA

NEPAL ARMY DAY PREPARATIONS

epa05796183 Nepalese Army commandos perform skills during a rehearsal for the annual Army Day in Kathmandu, Nepal, 16 February 2017. Nepal's Army Day falls on upcoming 24 February, which coincides with the Hindu festival of Mahashivratri. The Nepalese army is active since 1744 and it has a size of about 95,000 infantry army and air service members. EPA/NARENDRA SHRESTHA

NEPAL ARMY DAY PREPARATIONS

epa05796181 Nepalese Army commandos perform rescue skills during a rehearsal for the annual Army Day in Kathmandu, Nepal, 16 February 2017. Nepal's Army Day falls on upcoming 24 February, which coincides with the Hindu festival of Mahashivratri. The Nepalese army is active since 1744 and it has a size of about 95,000 infantry army and air service members. EPA/NARENDRA SHRESTHA

NEPAL ARMY DAY PREPARATIONS

epa05796177 Nepalese Army commandos perform skills during a rehearsal for the annual Army Day in Kathmandu, Nepal, 16 February 2017. Nepal's Army Day falls on upcoming 24 February, which coincides with the Hindu festival of Mahashivratri. The Nepalese army is active since 1744 and it has a size of about 95,000 infantry army and air service members. EPA/NARENDRA SHRESTHA

NEPAL ARMY DAY PREPARATIONS

epa05796175 Nepalese Army commandos perform skills during a rehearsal for the annual Army Day in Kathmandu, Nepal, 16 February 2017. Nepal's Army Day falls on upcoming 24 February, which coincides with the Hindu festival of Mahashivratri. The Nepalese army is active since 1744 and it has a size of about 95,000 infantry army and air service members. EPA/NARENDRA SHRESTHA

NEPAL ARMY DAY PREPARATIONS

epa05796174 Nepalese Army commandos perform rescue skills as they abseil from a helicopter during a rehearsal for the annual Army Day in Kathmandu, Nepal, 16 February 2017. Nepal's Army Day falls on upcoming 24 February, which coincides with the Hindu festival of Mahashivratri. The Nepalese army is active since 1744 and it has a size of about 95,000 infantry army and air service members. EPA/NARENDRA SHRESTHA

NEPAL ARMY DAY PREPARATIONS

epa05796173 Nepalese Army commandos perform rescue skills as they abseil from a helicopter during a rehearsal for the annual Army Day in Kathmandu, Nepal, 16 February 2017. Nepal's Army Day falls on upcoming 24 February, which coincides with the Hindu festival of Mahashivratri. The Nepalese army is active since 1744 and it has a size of about 95,000 infantry army and air service members. EPA/NARENDRA SHRESTHA

LITHUANIA NATO DEFENCE EXERCISE

epa05656130 A female soldier presents the NATO flag during the closing ceremony of the multinational military exercise 'Iron Sword 16' near Vilnius, Lithuania, 02 December 2016. The exercise of the North Atlantic Treaty Organization (NATO) includes about 4,000 troops from Latvia, Canada, Estonia, Germany, Lithuania, Luxembourg, Poland, Romania, Britain the US, which are the same countries that will contribute to the four NATO battalions in the Baltic States and Poland in 2017. EPA/OLIVIER HOSLET

SERBIEN MILITAER FLUGZEUG SUPER GALEB-4

In this photo taken on Oct. 13, 2016, Serbian air force Super Galeb-4 (Super Seagull-4), multi-purpose jet rolls on the tarmac before a flight during the joint Russian-Serbian military exercises BARS (Brotherhood of Aviators of Russia and Serbia) 2016, at the military airport Batajnica, near Belgrade, Serbia. Serbia's defense ministry says an air force jet has crashed in western Serbia with two of its crew missing. A statement said the G-4 Super Galeb (Seagull) trainer aircraft has crashed in western Serbia at 10:30 local (8:30 GMT) Friday, April 7, 2017 during a routine training flight. (KEYSTONE/AP Photo/Darko Vojinovic)

SPEZIALEINHEIT LUCHS DER POLIZEI LUZERN BEI UEBUNG MIT HELIKOPTER EC 635, RETTUNGSMANNSCHAFT SEILT AB, SCHWEIZ

Spezialeinheit Luchs der Polizei Luzern bei Uebung mit Helikopter EC 635, Rettungsmannschaft seilt ab, Schweiz. Lucerne police, Luchs special unit doing helicopter exercise, EC 635, rescue team abseiling, Switzerland (KEYSTONE/imageBROKER/Oliver Gutfleisch)

SPEZIALEINHEIT LUCHS DER POLIZEI LUZERN BEI UEBUNG MIT HELIKOPTER EC 635, MIT RETTUNGSMANNSCHAFT, SCHWEIZ

Spezialeinheit Luchs der Polizei Luzern bei Uebung mit Helikopter EC 635, mit Rettungsmannschaft, Schweiz. Lucerne police, Luchs special unit doing helicopter exercise, EC 635, rescue team abseiling, Switzerland (KEYSTONE/imageBROKER/Oliver Gutfleisch)