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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)

Bravo Battery, 62nd Air Defense Artillery Regiment, 69th Air Defense Artillery Brigade emplaced onto the new training area for a month long exercise (U.S. Army photo by Sgt. Brandon Banzhaf)

A submarine undergoes maintenance at the government-owned Norfolk Naval Shipyard. (Navy)

Sailors signal that an F/A-18E Super Hornet fighter jet is ready for takeoff on the flight deck of aircraft carrier USS Ronald Reagan. (U.S. Navy)

Light reflects through an integrated circuit. (Lawrence Manning/Getty Images)

U.S. soldiers move in formation while controlling unmanned vehicles as part of an exercise in 2016 at Marine Corps Training Area Bellows, Hawaii. (Staff Sgt. Christopher Hubenthal/U.S. Air Force)

Caption: An MQ-9 Sea Guardian unmanned maritime surveillance aircraft system flies over Independence-variant littoral combat ship USS Coronado. (U.S. Navy)

USS Ronald Reagan (CVN 76) leads a formation of Carrier Strike Group 5 ships during Valiant Shield 2018. U.S. NAVY / MASS COMMUNICATION SPECIALIST 3RD CLASS ERWIN MICIANO