Bad timing
This show had potential but I think the timing if it was bad. In the post-Vietnam 80s people wanted to feel good about themselves again.
Hence the reason for the escapist television of the 80s Family Ties, Cheers, The Cosby Show, Silver Spoons.
The political shows of the 70s had their
place and time, but so many of them toned down losing any real direction or conflict.
Maybe in 1973 the show would've had more relevance with Vietnam veterans returning. Ironically a subject very people wanted to deal with.
By time AfterMASH went on Korea had been over 30 years Vietnam war 8-10 years