U.S. Marine Corps Sgt. Gabriel E. Herrera, a drill

U.S. Marine Corps Sgt. Gabriel E. Herrera, a drill instructor from 2nd Battalion at Marine Corps Recruit Depot San Diego, monitors Marine Corps Recruiting Substation North Phoenix enlistee to raise his voice during a physical training exercise at the Metrocenter Mall in Phoenix, March 3, 2016. Herrera, a native of Jacksonville, Fla., emphasized that the enlistees always put forth their best effort. The enlistees are currently part of the delayed entry program and are awaiting their dates to ship to boot camp. Herrera and three other drill instructors are visiting the Phoenix region through March 6 to provide enlistees and potential applicants a first-hand preview of what they may be able to expect once they step onto the yellow footprints at boot camp. (Official U.S. Marine Corps photo by Sgt. Tyler J. Bolken)