A Ranger Assessment Course student completes the water survival portion of the course at the Municipal Pool, Las Vegas, Oct. 2, 2014. During this portion of the test, students are required to keep their head and weapon above the surface of the water. The two-week course is stress-oriented and develops the student's ability to lead and command under heavy mental, emotional and physical stress. (U.S. Air Force photo by <PERSON> <PERSON>)