A Marine provides cover fire with an M16A4 rifle during an infantry platoon battle course on Fort Pickett, Va., April 15, 2015. A Marine provides cover fire with an M16A4 rifle during an infantry platoon battle course on Fort Pickett, Va., April 15, 2015. SHARE IMAGE: Download Image: Full Size (1.61 MB) Tags: Photo Essays Photo By: VIRIN: 565419-A-UET43-415.jpg Photo Gallery