A U.S. Marine piloting an AV-8B Harrier 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. As the 15th MEU’s air combat element, the AV-8B Harrier pilots conducted both day and night operations in order to hone their skills. (U.S. Marine Corps photo by Cpl. Steve H. Lopez/Released)