Correction: This is an Air Force RESERVE aircraft of the 911th Airlift Wing in Pittsburgh, Pa. There is a big difference between the Reserves and ANG. The same airport has KC-135s of the Pennsylvania ANG, but the Herks (and soon C-17's) are AF Reserves.
Best way to tell is on the tail, AFRC means Air Force Reserve Command, while the guard will have ANG on the tail (and usually the National Guard logo). Also, guard Herks will generally have [STATE] AIR NATIONAL GUARD on the wheel well above the mains, and above an right of the crew entrance door will be the ANG shield, not the AFRC shield.
BTW, that particular tail number is at (or on the way to) the boneyard, and not at Pittsburgh anymore.