GRENADE LAUNCHER U.S. Navy Petty Officer 2nd Class Matthew Dunkle, left, loads training rounds into an MK19 40mm grenade launcher while participating in marksmanship training on Camp Leatherneck in Helmand province, Afghanistan, June 1, 2013. Dunkle, a construction mechanic, is assigned to Naval Mobile Construction Battalion 15's convoy security element. SHARE: Download: Full Size (0.07 MB) Credit: VIRIN: 910382-T-KDJ29-252.jpg Photo Gallery