English: Spc. Andrew Vrooman, assigned to Headquarters and Headquarters Company, 1st Battalion (Airborne), 501st Infantry Regiment of the 4th Brigade Combat Team (Airborne), 25th Infantry Division, a native of Fort Ann, N.Y., makes a correction to his scope during the final day of M110 Semi-Automatic Sniper System (SASS) qualifications at Joint Base Elmendorf-Richardson's Grezelka Range, July 10, 2013. The brigade's soldiers are attending the U.S. Army Mobile Sniper School, a five-week course with graded marksmanship on the M24 Sniper System, M110 SASS, and the M107 .50-Caliber Long Range Sniper Rifle. Students are also trained and graded in range estimation, target detection, stalking techniques, and written exams. Upon successful completion, all students will receive a diploma and those soldiers holding an infantry and/or special forces military occupational specialty will receive a B4 additional skill identifier. (U.S. Air Force photo/Justin Connaher)