Petty Officer 3rd Class Celina Sweat (left), and Petty Officer Second Class Regina Belty, corpsmen serving with 1st Dental Battalion, 1st Marine Logistics Group, stand at parade rest before the start of a chief petty officer promotion ceremony here, Sept. 14, 2012. Sweat, a 28-year-old native of Laredo, Texas, and Belty, a 26-year-old native of Hemphill, Texas, represented the battalion at the ceremony held at the Field Medical Training Battalion parade deck. Corpsmen assigned to Marine units receive field training at the battalion to be able to perform as line corpsmen in infantry battalions.