Marines from Company I, 3rd Battalion, 1st Marine Regiment depart from an MV-22B Osprey to conduct a simulated embassy reinforcement training exercise at Joint Reserve Training Center Los Alamitos, California, April 11, 2015. The embassy reinforcement operation was a part of the 15th Marine Expeditionary Unit’s certification exercise, the last training exercise the MEU conducts before deployment. - Marines from Company I, 3rd Battalion, 1st Marine Regiment depart from an MV-22B Osprey to conduct a simulated embassy reinforcement training exercise at Joint Reserve Training Center Los Alamitos, California, April 11, 2015. The embassy reinforcement operation was a part of the 15th Marine Expeditionary Unit’s certification exercise, the last training exercise the MEU conducts before deployment.