U.S. Marines with Kilo Company, Battalion Landing Team 3rd Battalion, 1st Marine Regiment, 15th Marine Expeditionary Unit, rehearse urban operation tactics aboard USS Rushmore at sea in the Pacific Ocean, June 1, 2015. BLT 3/1 constantly trains for the unknown in order to respond to the needs of the MEU while deployed. These drills keep the Marines in a constant state of combat readiness while at sea. - U.S. Marines with Kilo Company, Battalion Landing Team 3rd Battalion, 1st Marine Regiment, 15th Marine Expeditionary Unit, rehearse urban operation tactics aboard USS Rushmore at sea in the Pacific Ocean, June 1, 2015. BLT 3/1 constantly trains for the unknown in order to respond to the needs of the MEU while deployed. These drills keep the Marines in a constant state of combat readiness while at sea.