English: soldier, assigned to Headquarters and Headquarters Company, 3rd Battalion (Airborne), 509th Infantry Regiment of the 4th Brigade Combat Team (Airborne), 25th Infantry Division, fires as Staff Sgt. Kevin Corter, an instructor with the U.S. Army Sniper School and a native of Casa Grande, Ariz., watches during the final day of M110 Semi-Automatic Sniper System (SASS) qualifications at Joint Base Elmendorf-Richardson's Grezelka Range. 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.