![](http://www.alamy.com/thumbs/6/4A4F791A-0825-4DC3-84CA-9ED456EE3D92/FFH1MH.jpg)
Airmen assigned to the Air Force Special Tactics Training Squadron at Hurlburt Field, Fla., cross the pool underwater as part of their pre-scuba course.
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Photo credit: © LOU Collection / Alamy / Afripics
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