INFANTRY SKILLS U.S. Marine Corps Lance Cpl. John Hall looks down the sights of an AT-4 during a live-fire training exercise in Sierra Del Retin, Spain, March 24, 2015. U.S. Marines conducted a live-fire training exercise on the Spanish facility to maintain infantryman skills. Hall is a rifleman assigned to the Special Purpose Marine Air-Ground Task Force Crisis Response Africa. SHARE: Download: Full Size (0.06 MB) Credit: VIRIN: 621569-B-GLU34-963.jpg Photo Gallery