U.S. Navy Gunner's Mate 2nd Class Conner Mastry, Aviation Structural Mechanic 2nd Class Jacob Alvarado and retired Master Chief Marc Presson, a former SEAL, give instructions prior to a timed swim in a physical screening test for Naval Special Warfare/Naval Special Operations (NSW/NSO) candidates in Houston, Texas, Aug. 13, 2013. Mastry, Alvarado and Presson are all scouts and mentors with the NSW/NSO program, Navy Recruiting District Houston.