Petty Officer 2nd Class Jeremiah Parker, 628th Security Forces Squadron master-at-arms, mounts a M240B machine gun during a weapons familiarization and proficiency training course March 14, 2013, at Fort Jackson, S.C. The 628th SFS performed the training for M240B proficiency for use on patrol boats on the Cooper River and surrounding waterways. (U.S. Air Force photo/Senior Airman George Goslin)