AR-15s, NASA edition

Astronaut Ron Garan with a raygun prepared to defend Earth from an alien invasion. Just kidding, he is just holding NASA’s version of the sonic screwdriver
While there are no U.S. guns in space (that we know of) to secure their facilities nationwide, NASA contracts a variety of protective forces and maintains Emergency Response Teams while the agency’s Office of Inspector General has armed special agents who refer their findings from investigations to the Department of Justice for prosecution.
They also own and run a series of dedicated small arms ranges (for up to 7.62x51mm) to keep all of the above qualified and up to snuff.
With that, the country’s space agency just released a tender for some AR-15s, and it is written to pretty much be S&W M&P15s.
More in my column at Guns.com.
