Gums,
Air Force math at work....April 1970 to Easter 1972 is almost two years by Army Math.
I was there from day one of the Cambodia thing (and before we were inside there)....but my stay got cut short by some .51 Caliber AAA fire up north of Bu Dop.
On my first Tour, I slung load one of your A-37's from Vinh Long to Bien Hoa one evening....after it had a hydraulics failure. All went well until one of the Sling Points on to the A-37 broke and caused the aircraft to hang one wing down....we got it down with just a small ding to the Wing Tank fin.