Spooky is a bone the Zoomies threw the Army, due to the Key West Agreement. You will notice that Air Force close air support is shoved off to the fringes, with the AC-130 as part of fringe Special Ops squadrons.
You can always tell what the Air Force mind thinks of some war toy by it's place in the TO. JSTARS is right in the middle, Spooky is out in left field. Ask the Army if they would prefer Air Force support, or Marine.
The Key West agreement is a wonderful thing. Look it up. It explains a lot about why the Pentagon does what it does.
Been there done that, 10 Years joint service. I don't know of any Army Ranger who would turn down an AC-130 of A-10...