PFC Greg Zecher and PFC Nicholas Roberts, machine gunners with Lima Company, 3rd Battalion, 3rd Marine Regiment, illuminate the night sky by firing tracer rounds and then reloading their weapons during Exercise Clear, Hold, Build 3 on Marine Corps Air Ground Combat Center Twentynine Palms, Calif., Sept. 21, 2011. (Cpl. Reece Lodder. US Marine Corps)
