SAN DIEGO (July 9, 2012) Sailors aboard the amphibious transport dock ship USS Green Bay (LPD 20) wear a joint service mask leakage detection canopy to test the seal integrity of their MCU-2P gas masks. Green Bay held fit testing for new gas masks in preparation for an upcoming deployment. (U.S. Navy photo by Mass Communication Specialist 1st Class Elizabeth Merriam/Released)
