Governor Mary Fallin has authorized Oklahoma's adjutant general to arm full-time personnel at military facilities across the state.

The move comes after four Marines were killed in a shooting at several military facilities in Chattanooga, Tenn. Thursday.

"Four unarmed Marines were killed in what appears to be a domestic terrorist attack," said Fallin. "It is painful enough when we lose members of our armed forces when they are sent in harm's way, but it is unfathomable that they should be vulnerable for attack in our own communities. For that reason, I want to make sure that our National Guardsmen are authorized to arm themselves at our military facilities."

Gov. Fallin issued the executive order citing Sections 2 and 6 of Article VI of the Oklahoma Constitution which allows Maj. Gen. Robbie L. Asher to arm certain full-time personnel at Oklahoma military installations with weaponry as he deems necessary. The order also allows for military recruiting offices to be armed.

The governor also issued an executive order to fly all flags on state property at half-staff through 8 a.m. July 20 in honor of the Marines killed in Tennessee.