SUNSET STRUT A U.S. Army soldier is silhouetted against the sun as he carefully balances his way across a log on the obstacle course portion of the Pre-Ranger Course in the Mojave Desert, Fort Irwin, Calif., May 18, 2009. The purpose of the 14-day course is to prepare soldiers to succeed in the U.S. Army Ranger School. SHARE: Download: Full Size (0.04 MB) Credit: VIRIN: 219636-U-WUE66-434.jpg Photo Gallery