U.S. Army Sgt. 1st Class Barry Poynter, observer coach/trainer with the 2nd Battalion, 307th Field Artillery Regiment, 157th Infantry Brigade, gives a safety brief and final set of instructions to Sgt. 1st Class Eugene Vaillancourt and Sgt. 1st Class Phillip DeVos, prior to beginning the mounted land navigation training at Camp Atterbury Joint Maneuver Training Center, Ind., Dec. 4, 2013.