A U.S. Army paratrooper adjusts the M68 close combat optic of an M-4 rifle while zeroing weapons on a range at Al Asad, Iraq, Aug. 24, 2009. A U.S. Army paratrooper adjusts the M68 close combat optic of an M-4 rifle while zeroing weapons on a range at Al Asad, Iraq, Aug. 24, 2009. SHARE: Download: Full Size (2.59 MB) Tags: Photo Essays Credit: VIRIN: 760186-F-MEX09-023.jpg Photo Gallery