Staff Sgt. Richard Kellner, 1st Security Forces Squadron Combat Arms, assists trainees in "zeroing" their weapons at the firing range. By marking the position of their bullets, he helps adjust the rifle's sights. Team Langley members train on the M-9 Beretta handgun and the M-4 assault rifle at the Combat Arms Training and Maintenance (CATM) course on Dec. 14, 2005 at Langley Air Force Base, Virginia. (U.S. Air Force photo by Staff Sgt. Verlin Levi Collins)