MARKSMANSHIP TRAINING U.S. Navy Seaman Jeffrey Dimon, front, prepares an MK19 40mm grenade launcher while participating in marksmanship training on Camp Leatherneck, Helmand province, Afghanistan, June 1, 2013. Dimon, a construction mechanic, is assigned to Naval Mobile Construction Battalion 15's convoy security element. SHARE IMAGE: Download Image: Full Size (0.07 MB) Photo By: VIRIN: 148466-Y-JDG93-189.jpg Photo Gallery