International student training
BOGOTA, Colombia -- While on a temporary assignment here, Tech. Sgt. Alwin Lopez (on ladder) explains general hydraulic principles and inspection techniques to Colombian military students. Sergeant Lopez is a a C-130 Hercules crew chief from the 653rd Combat Logistics Support Squadron at Robins Air Force Base, Ga. He is in Columbia supporting the Air Force Security Assistance Training Squadron program. (Courtesy photo)