Master Sgt. Robert Alvarado, 41st Rescue Squadron special missions aviator, breathes through a bottle while underwater, Jan. 26, 2018, at Moody Air Force Base, Ga. Aircrew members participated in an underwater survival course to prepare themselves for a situation in which their aircraft were to crash in the water. ( Air Force

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Photo credit: © RP Library / Alamy / Afripics
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