mid-century Vietnam vintage, USAF blue uniform jacket w/patches&buttons

Vintage United States Air Force blue uniform jacket. This uniform has silver colored buttons and is marked "tropical shade 1549 class 2", "De Rossi & Son Co" and "60% poly - 40% wool". We're not sure of the exact rank or vintage of this coat, but we're guessing the vintage is 1960s, Cold War or Vietnam War vintage. We were told that the shoulder rank patches are for a technical sergeant, but we're not sure.

This uniform jacket measures about 16 1/2" long on the arm (from the armpit to the sleeve cuff), 44" around the chest (under the arms), 19" across the shoulders and 28" long from the base of the collar to the hem in the back.