BATTLESIGHT ZERO U.S. Marines prepare their weapons before firing at their targets during a battlesight zero course on Camp Leatherneck in Afghanistan's Helmand province, Oct. 25, 2013. The Marines, assigned to Headquarters, 2nd Marine Aircraft Wing, took the course to maintain proficiency with the M16 and M4 service rifles issued to Marines. SHARE: Download: Full Size (0.05 MB) Credit: VIRIN: 149413-S-CUD71-033.jpg Photo Gallery