Airman First Class Ray Wilkerson, a crew chief from the 113th Maintenance unit tests sight alignment adjustments during a M16-A2 qualifications course July 16, 2011, at the combat arms training and maintenance center Joint Base Andrews, Md. Airman from the 113th practice and qualify with the M16-A2 July 16, 2011. (U.S. Air Force photos/Tech Sgt. Gareth Buckland/Released)