2/10/2015 - Naval Nuclear Power Training Command students study well into the night using a chalk board to solve equations and prepare for their next exam Feb. 9, 2015, at Joint Base Charleston – Weapons Station. NNPTC classrooms remain open until midnight, so students can study any part of the curriculum. Instructors also stay after hours to work with Sailors individually, which is not always possible during a typical school day. (U.S. Air Force photo/ Senior Airman Dennis Sloan)