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European flags flutter in the wind in front of the Berlaymont building, the seat of the European Commission (Photo by Marcel Kusch/picture alliance via Getty Images)

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A plane director signals to the pilot of an F/A-18C Hornet from the "Wildcats" of Strike Fighter Squadron (VFA) 131 after landing on the flight deck of the Nimitz-class aircraft carrier USS Dwight D. Eisenhower (U.S. Navy)

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Soldiers stand beside damaged operational vehicles recovered from Boko Haram jihadists on display at the headquarters of the 120th Battalion in Goniri, Yobe State, in Nigeria's restive northeast on July 3, 2019. (Audu Marte/AFP via Getty Images)

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American and British transportation planes supplied food to Berlin's Western sector, which was isolated by the Soviet's blockade (Photo by Keystone-France/Gamma-Keystone via Getty Images)