Lance Cpl. Skyler Schopf, team leader, 3rd Battalion, 4th Marine Regiment, fires a M136 AT4 anti-tank weapon during a live-fire training exercise as part of Tactical Small-Unit Leadership Course at Marine Corps Air Ground Combat Center, Twentynine Palms, California, July 18, 2016. The purpose of the course was to focus on the training of small-unit leadership within “Darkside.” - Lance Cpl. Skyler Schopf, team leader, 3rd Battalion, 4th Marine Regiment, fires a M136 AT4 anti-tank weapon during a live-fire training exercise as part of Tactical Small-Unit Leadership Course at Marine Corps Air Ground Combat Center, Twentynine Palms, California, July 18, 2016. The purpose of the course was to focus on the training of small-unit leadership within “Darkside.”