Hmmm....I looked more deeply at the better copy on the DoD site  it was obviously done on some sort of impact device given its uneveness. I was thinking that it could maybe be a 24 pin printer, but I don't see any dotty effects. A line printer would be inappropriate for such a letter. It could also be from an old daisywheel, but if was created in 2000, it would still would have been a decade after the last daisywheel system would have pooped out. It was therefore most likely a typewriter, which in 2000 would have been the last gen of the electronic office models. While still a typewriter, that would still be a few generations removed from anything available in 1972. FYI. -BC aka    