Gunnery Sgt. Matthew Hafner, a sergeant instructor at Officer Candidates School, gives attendees of the Sept. 21 Marine Corps Acculturation Program a taste of what Marine recruits and officer candidates experience during boot camp and officer training. Photo by Heather Hagan, public affairs officer for HQMC Marine & Family Programs. - Gunnery Sgt. Matthew Hafner, a sergeant instructor at Officer Candidates School, gives attendees of the Sept. 21 Marine Corps Acculturation Program a taste of what Marine recruits and officer candidates experience during boot camp and officer training. Photo by Heather Hagan, public affairs officer for HQMC Marine & Family Programs.