Aligning Targeting Points Marine Corps Lance Cpl. Fernando A. Castillo aligns targeting reference points to ensure accurate fire with 81 mm mortars during training on Farallon de Medinilla Range, Northern Mariana Islands, Sept. 16, 2016. Castillo is a mortarman assigned to Weapons Company, Battalion Landing Team, 2nd Battalion, 4th Marine Regiment, 31st Marine Expeditionary Unit. Marine Corps photo by Staff Sgt. T.T. Parish SHARE: Download: Full Size (0.36 MB) Tags: Marines, training, Marine Corps Credit: Staff Sgt. T. T. Parish VIRIN: 160916-M-PJ332-197A.JPG Photo Gallery