Crucible Challenge A Marine Corps recruit points a weapon from behind a tree during the final challenge of recruit training, known as the Crucible, at Marine Corps Recruit Depot Parris Island, S.C., Feb. 21, 2019. SHARE: Download: Full Size (5.78 MB) Tags: training, Marine Corps Credit: Marine Corps Warrant Officer Bobby J. Yarbrough VIRIN: 190222-M-DE426-137C.JPG Photo Gallery