RAPPEL REFLEX U.S. Marine Corps 1st Lt. Sean Williams rappels down a 30-meter rock face while participating in the South Korea Marine Corps Basic Rangers Course in Pohang, South Korea, July 6, 2010. Williams, an amphibious assault vehicle platoon commander, is assigned to the 3rd Marine Division. More than 50 U.S. Marines participated in the course. SHARE: Download: Full Size (0.241531 MB) Tags: Week In Photos, Week In Photos Credit: VIRIN: 172584-J-CGU80-303.jpg Photo Gallery