David Crawford, air traffic controller specialist for Marine Corps Air Facility Quantico, carefully observes local air traffic in the radar room on July 31, 2013. MCAF maintains one of the most complex airspaces in the Marine Corps, including two military operation airspaces, a restricted airspace and a Special Flight Rules Airspace. - David Crawford, air traffic controller specialist for Marine Corps Air Facility Quantico, carefully observes local air traffic in the radar room on July 31, 2013. MCAF maintains one of the most complex airspaces in the Marine Corps, including two military operation airspaces, a restricted airspace and a Special Flight Rules Airspace.

Marines float and tread water during their swim qualification in the Ramer Hall pool at The Basic School on Feb. 4. Marines are able to tread water or use their blouse or trousers as a floatation device. - Marines float and tread water during their swim qualification in the Ramer Hall pool at The Basic School on Feb. 4. Marines are able to tread water or use their blouse or trousers as a floatation device.