Louder! Marine Corps Staff Sgt. Joshua M. Cardona, left, instructs a new recruit to respond louder at Marine Corps Recruit Depot San Diego, Feb. 1, 2016. Recruits must respond to everything a drill instructor says to develop instant obedience to orders. Cardona is a drill instructor assigned to Receiving Company, Support Battalion. U.S. Marine Corps photo by Sgt. Tyler Viglione SHARE IMAGE: Download Image: Full Size (0.89 MB) Tags: Drill instructor, SAN DIEGO , marine, Recruit, MARINE CORPS Photo By: Sgt. Tyler Viglione VIRIN: 160201-M-HG842-001.JPG Photo Gallery