U.S. soldiers set up an M120 mortar system to provide base defense on Forward Operation Base Lightning in Paktia province, Afghanistan, Nov. 13, 2013. The soldiers are assigned to 3rd Squadron, 71st Cavalry Regiment. U.S. soldiers set up an M120 mortar system to provide base defense on Forward Operation Base Lightning in Paktia province, Afghanistan, Nov. 13, 2013. The soldiers are assigned to 3rd Squadron, 71st Cavalry Regiment. SHARE: Download: Full Size (2.08 MB) Tags: Photo Essays Credit: VIRIN: 425127-M-GVY17-092.jpg Photo Gallery