U.S. Coast Guard Gunners Mate 2nd Class Tobias Perio, right, with Maritime Safety and Security Team 91110, instructs Boatswains Mate 3rd Class Branislav Grulich on swimming procedures during the drown-proofing portion of water survival training at the Marine Hill pool at Guantanamo Bay, Cuba, Oct. 4, 2011. The Coast Guardsmen are required to stay proficient with rescue and survival equipment worn while under way on vessels.