CARBINE CONCENTRATION A Marine fires his M4 Carbine at a target during a fire-team rushing exercise on Fort Pickett, Va., Sept. 8, 2012. The Marine is assigned to Battalion Landing Team 3/2, 26th Marine Expeditionary Unit. SHARE IMAGE: Download Image: Full Size (0.08 MB) Photo By: VIRIN: 625288-E-UOZ34-314.jpg Photo Gallery