An Israeli Sikorsky CH-53 Sea Stallion helicopter performs during an air show at the graduation ceremony of Israeli Air Force pilots at the Hatzerim base in the Negev desert, near the southern Israeli city of Beer Sheva, on June 27, 2019. (JACK GUEZ/AFP/Getty Images)
Russian T-80 tank fires during the International Military Technical Forum Army-2018 in Alabino, outside Moscow, Russia, Saturday, June 29, 2019. (AP Photo/Pavel Golovkin)
This photo taken on June 29, 2019 shows USS Montgomery (LCS 8), an Independence-class littoral combat ship of the U.S. Navy, in Davao City on the southern island of Mindanao for a port visit. (MANMAN DEJETO/AFP/Getty Images)
NZ Army personal get ready for loading on to the HMNZS Canterbury on June 29, 2019 in Napier, New Zealand. Exercise Talisman Sabre 2019 is the largest exercise that the Australian Defence Force (ADF) conducts with all four services of the United States armed forces. The biennial exercise focuses on crisis action planning and humanitarian missions, enhancing participating nations capabilities to deal with regional contingencies and terrorism. (Photo by Kerry Marshall/Getty Images)
An Israeli F-15 I fighter jet takes off during an air show at the graduation ceremony of Israeli Air Force pilots at the Hatzerim base in the Negev desert, near the southern Israeli city of Beer Sheva, on June 27, 2019. (JACK GUEZ/AFP/Getty Images)
A Swedish soldier stands in front of a search radar system in Visby, Sweden, on July 1, 2019. - Sweden's armed forces said it had deployed a new surface-to-air missile system on the island of Gotland in the Baltic Sea, following years of increased militarisation in the region. (HENRIK MONTGOMERY/AFP/Getty Images)
Israeli C-130 Hercules, launches anti-missile flares during an air show at the graduation ceremony of Israeli Air Force pilots at the Hatzerim base in the Negev desert, near the southern Israeli city of Beer Sheva, on June 27, 2019. (JACK GUEZ/AFP/Getty Images)
A burning Eurofighter is seen in the sky above Malchow on June 24, 2019. - One pilot was killed after two German fighter jets collided and crashed Monday in the north of the country, an Air Force spokesman said, with the reason for the accident unclear. (THOMAS STEFFAN/AFP/Getty Images)
The Russian Federation Navy Admiral Gorshkov frigate arrives to Havana's port on June 24, 2019. - A Russian naval detachment, led by the frigate Admiral Gorshkov, arrived in Havana on Monday in times of high tension between the island and the United States. (ADALBERTO ROQUE/AFP/Getty Images)
Two Eurofighter Typhoon planes are pictured during a training flight ahead of the F1 Grand Prix of Austria at Red Bull Ring on June 27, 2019 in Spielberg, Austria. (GEORG HOCHMUTH/AFP/Getty Images)
An anti-aircraft rocket system is displayed at an arms fair in Belgrade, Serbia, Tuesday, June 25, 2019. Serbia, which claims military neutrality, is negotiating additional arms purchases from Russia, including attack and transport helicopters and air defense systems. (AP Photo/Darko Vojinovic)
A mirage 2000-5 practices an exercise with a civilian airplane at the Luxeuil-Saint Sauveur air-base 116 in Saint-Sauveur, eastern France, on June 24, 2019. (SEBASTIEN BOZON/AFP/Getty Images)
Belarus army planes fly over the city as they prepare for a military air show ahead of the Independence Day military parade, Minsk, Belarus, Monday, July 1, 2019. The military parade will take place on July 3. (AP Photo/Sergei Grits)
Russian Swifts aerobatic team's MiG-29 jets perform during the International Military Technical Forum Army-2018 in Alabino, outside Moscow, Russia, Saturday, June 29, 2019. (AP Photo/Pavel Golovkin)
Air Force F-15 Eagles conduct aerial operations over the North Sea, June 27, 2019, during Point Blank 19-2, a multinational training exercise supporting U.S., U.K. and French national interests. (Tech. Sgt. Matthew Plew/Air Force)
Personnel Specialist Seaman Dedrick Johnson, left, from Vidalia, Georgia, BoatswainÕs Mate 1st Class Jacob Meadows, center, from Lake Elsinore, California, and Machinist Mate 3rd Class Tyler Martin, from Perrin, Texas, run past the foul line as a SA-330J Puma picks up pallets from the flight deck of the amphibious dock landing ship USS Ashland (LSD 48) prior to a replenishment-at-sea with the amphibious assault ship USS Wasp (LHD 1) and fleet replenishment oiler USNS Rappahannock (T-AO 204). (MC2 Markus Castaneda/Navy)