Veterans of the 7th Marine Regiment bow their heads during the invocation of the ceremony at Lance Cpl Torrey L. Gray Field, Marine Corps Air Ground Combat Center, Twentynine Palms, Calif., Sept. 15th, 2017. The 7th Marine Regiment celebrated its 100th anniversary with a rededication of regimental battle colors and a parade of troops. (U.S. Marine Corps photo by Lance Cpl Preston Morris) - Veterans of the 7th Marine Regiment bow their heads during the invocation of the ceremony at Lance Cpl Torrey L. Gray Field, Marine Corps Air Ground Combat Center, Twentynine Palms, Calif., Sept. 15th, 2017. The 7th Marine Regiment celebrated its 100th anniversary with a rededication of regimental battle colors and a parade of troops. (U.S. Marine Corps photo by Lance Cpl Preston Morris)