A KC-130J Hercules flown by pilots with Marine Aerial Refueler Transport Squadron (VMGR) 352 “Raiders” flies over mountainous terrain during low-level tactical navigation training outside of Yuma, Ariz., July 24. The training allowed pilots to earn qualifications, known as codes, under the instruction of a flight commander. - A KC-130J Hercules flown by pilots with Marine Aerial Refueler Transport Squadron (VMGR) 352 “Raiders” flies over mountainous terrain during low-level tactical navigation training outside of Yuma, Ariz., July 24. The training allowed pilots to earn qualifications, known as codes, under the instruction of a flight commander.