Special Tactics Training Squadron students wait for direction during a pre-scuba class at Hurlburt Field, Florida, Sept. 5, 2018. Pre-scuba familiarizes Special Tactics trainees with the basics of water operations by performing tasks such as tying knots underwater, learning how to bob without their arms and hands, and how to buddy breathe.

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Photo credit: © Bob Collet / Alamy / Afripics
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