Mask Task A firefighting instructor helps a recruit properly seal her gas mask in a Recruit Training Command confidence chamber at Naval Station Great Lakes, Ill., Jan. 18, 2017. Recruits attend a week of firefighting training to gain basic knowledge and confidence in the Navy's firefighting equipment. Navy photo by Chief Petty Officer Seth Schaeffer SHARE: Download: Full Size (0.89 MB) Credit: Chief Seth Schaeffer VIRIN: 170118-N-SL853-026.JPG Photo Gallery