First Sgt. Michael Grassl, Bravo Company first sergeant,

First Sgt. Michael Grassl, Bravo Company first sergeant, 1st Battalion, 7th Marine Regiment, and a native of Vesper, Wisc., accounts for Marines as they are transported by helicopters to Range 210 during a live-fire exercise at Marine Corps Air Ground Combat Center Twentynine Palms, Calif., Jan. 25, 2014. After the Marines landed, they maneuvered through a simulated urban environment with unique shock-absorbent walls. This allowed for them to engage in realistic live-fire training. (U.S. Marine Corps photo by Cpl. Joseph Scanlan / released)