The pilots who qualify will be allowed to carry semi-automatic pistols on domestic US flights served by American carriers.

BBC: US airline pilots get guns

U.S. Capitol Police carry 40-caliber semi-automatic pistols, called Glock 22s.

CNN: Troops may help bolster Capitol security

And in Los Angeles, itself, the Police Commission voted to allow officers to carry .45-caliber semi-automatic pistols.

CNN: Result of being outgunned in February shootout