171012-N-YF227-028 BREMERTON, Wash. (Oct. 12, 2017) Sailors assigned to USS John C. Stennis (CVN 74) test the seal on M50/M51 joint service general purpose gas masks during a fitting in the ship's hangar bay. John C. Stennis is in port training for future operations after completing flight deck certification and conducting carrier qualifications. (U.S. Navy photo by Mass Communication Specialist 3rd Class William Ford/Released)