Aviation Specialties Unlimited, Inc., (ASU) announced today that they delivered four prototype helmets to the U.S. Air Force at Nellis Air Force Base in Las Vegas, Nevada. ASU was one of only three finalists selected by the AFWERX Fixed Wing Helmet Challenge in November of 2018. More than 110 companies submitted helmet designs initially in 2018.  In October of 2018, the field narrowed to 38 companies and lastly to the final three.