SOCOM is looking for a new way to get portable oxygen to troops in need. Here, Matt Hernandez repairs an oxygen generator at the U.S. Army Medical Materiel Agency's depot at Hill Air Force Base, Utah.

Also, a visor is more likely to mist up when you are breathing hard due to exertion than goggles and has less ... There are two general types of helmet strap fastener – a D-Ring and a ratchet ...