Carbine Calculation A soldier marks a target during training to qualify on the M4 carbine at Joint Base Lewis-McChord, Wash., May 18, 2016. The routine training allows soldiers to improve basic skills and increase unit readiness. The soldiers are assigned to Headquarters Battery, 17th Field Artillery Brigade. Army photo by Capt. Tania Donovan SHARE IMAGE: Download Image: Full Size (1.7 MB) Tags: Army Photo By: Army Capt. Tania Donovan VIRIN: 160518-A-ZZ999-006.JPG Photo Gallery