170118-N-SL853-015 GREAT LAKES, Ill. (Jan. 18, 2017) Recruits from Divisions 055 and 056 tighten and check for air seals on their gas mask during the confidence chamber at Recruit Training Command for Fire Fighter Class II. Recruits attend a week of firefighting training to gain basic knowledge, understanding and confidence in the Navy's firefighting equipment. About 30,000-40,000 recruits graduate annually from the Navy's only boot camp. (U.S. Navy photo by Chief Petty Officer Seth Schaeffer/Released)