Cpl. Joshua Thomas weaves over and under logs while completing a confidence course. U.S. Marine Corps Cpl. Joshua Thomas, a corporal's course student at Marine Corps Air Station Miramar, weaves over and under logs while completing a confidence course at Marine Corps Recruit Depot, San Diego, on June 27, 2011. The course provides corporals with the education and leadership skills necessary to lead Marines. SHARE IMAGE: Download Image: Full Size (0.07 MB) Photo By: VIRIN: 360565-K-RRQ71-398.jpg Photo Gallery