Safety Brief Air Force Staff Sgt. Richard Prokop gives a safety briefing to airmen aboard a C-17 Globemaster III aircraft during a readiness exercise at Travis Air Force Base, Calif., Feb. 2, 2018. Prokop is a loadmaster assigned to the 21st Airlift Squadron. Air Force photo by Master Sgt. Joseph Swafford SHARE: Download: Full Size (1.47 MB) Tags: Air Force, Northcom, Northern Command, training, Airmen Credit: Master Sgt. Joseph Swafford VIRIN: 180202-F-QN515-0010A.JPG Photo Gallery