Concur. I'm an Army Brat from that era, and have all of Dad's old correspondence, and nothing looks even remotely like that doc. At best, it's all done on Selectrics with fixed-pitch Courier balls.
The dates definitely don't sound right. I know my husband did 2 years of inactive dute after Viet Nam, then he got his honorable discharge. Kerry's 1978 isn't right.