A U.S. Marine pilot with Medium Tiltrotor Squadron 161 (Reinforced), 15th Marine Expeditionary Unit, takes off from the USS Essex (LHD 2) during Amphibious Squadron/Marine Expeditionary Unit Integration Training (PMINT) off the coast of San Diego Feb. 24, 2015. Night-time training prepares the 15th MEU’s air combat element to operate at any time. (U.S. Marine Corps photo by Cpl. Steve H. Lopez/Released)