22 years TIS would mean he got out as an E-7 or O-5, or some level of CWO. (E-6 and O-4 who don't get picked up for the next grade get retired at 20 years.) But easily enough time and seniority to know what the OP meant by branch, especially once he listed infantry, armor, artillery, etc.
"Combat branch of the 82nd" sounds like a big red flag to me. The Army has "combat arms" branches, those being infantry, armor, artillery, air defense artillery, and special forces. Technically, engineers and aviation are considered "combat support," although I personally include combat engineers (as opposed to the construction types) and helo aviation to be combat arms.
Finally, it's pretty much impossible to spend an entire career in one division. About the only way to accomplish it, at least over the last 30 years or so, would be to spend your entire career overseas. And this only works for enlisted soldiers - they can (or at least could; I retired 4 years ago) do what was called COTs - Consecutive Overseas Tours, where if they were in a unit based overseas, they could volunteer for another, consecutive tour with a unit overseas, they could choose which overseas station they wanted. This was most common with GIs who married German girls and wanted to stay there. We had a SFC in my first unit who had been in that same battalion for I think 12 or 14 years. He finally had to leave because he got picked up for MSG, but there were no open slots.
But the 82nd is based at Ft. Bragg, NC, so that doesn't work.
He might have done what some 82nd 'homesteaders' do - stay at Bragg as long as they can, then volunteer for a 1 year stint in Korea. That gives them choice of duty station when they finish - so right back to Bragg. Lather, rinse, repeat.
My impression is that he is, at minimum, embellishing, if not outright faking.