Special Tactics Training Squadron students practice drown-proofing. Special Tactics Training Squadron students practice drown-proofing without using their arms and legs to simulate injury during pre-scuba training at Hurlburt Field, Fla., on Aug. 7, 2009. Drown-proofing is a technique injured people can use to aid breathing. SHARE: Download: Full Size (0.07 MB) Credit: VIRIN: 498645-X-NRA34-747.jpg Photo Gallery