U.S. Marine Cpl. Esgar Flores, a combat engineer with

U.S. Marine Cpl. Esgar Flores, a combat engineer with the Logistics Combat Element, Special Purpose Marine Air-Ground Task Force-Crisis Response-Central Command, sets up a concertina wire perimeter around a forward command operation center during a Command Post Exercise in Southwest Asia, July 12, 2015. The CPX tests communication between the forward COC and the SPMAGTF, a critical requirement should the unit send forward a small team of enablers and controllers to set conditions for follow-on forces in a developing contingency. (U.S. Marine Corps photo by Cpl. John Baker/Released)