An Air Force pararescue trainee low crawls during an obstacle course event at Medina Annex, Lackland Air Force Base, Texas, 18 August, 2011. The initial course for a Pararescuemen trainee is a 9-week extensive physical conditioning indoctrination program at Lackland AFB, Texas. The program includes physiological training, obstacle course, marches, dive physics, dive tables, metric manipulations, medical terminology, cardiopulmonary resuscitation, weapons qualifications, PJ history and leadership reaction course. (U.S. Air Force photo by Senior Airman Erik Cardenas/Released)