A U.S. Marine throws a training grenade during a live-fire exercise at Arta Range, Djibouti, Feb. 18, 2014. The Marine is assigned to 13th Marine Expeditionary Unit, Battalion Landing Team, Alpha Company, 1st Battalion, 4th Marine Regiment. The unit is deployed with the Boxer Amphibious Ready Group as a theater reserve and crisis response force throughout the U.S. 5th Fleet area of responsibility. A U.S. Marine throws a training grenade during a live-fire exercise at Arta Range, Djibouti, Feb. 18, 2014. The Marine is assigned to 13th Marine Expeditionary Unit, Battalion Landing Team, Alpha Company, 1st Battalion, 4th Marine Regiment. The unit is deployed with the Boxer Amphibious Ready Group as a theater reserve and crisis response force throughout the U.S. 5th Fleet area of responsibility. SHARE IMAGE: Download Image: Full Size (2.67 MB) Tags: Photo Essays Photo By: VIRIN: 663779-J-ZYE92-287.jpg Photo Gallery