Duet Shooters U.S. Marines fire weapons on deck during a sustainment exercise aboard the USS Boxer at sea, January 18, 2016. U.S. Marine Corps photo by Sgt. Hector de Jesus SHARE IMAGE: Download Image: Full Size (1.72 MB) Photo By: Sgt. Hector de Jesus VIRIN: 160118-M-PC554-307.JPG Photo Gallery