I can't follow all these threads but has anyone asked if the military (esp. the ANG) would use typewriters from the early 1970s if they still had typewriters of earlier vintage still in use? My experience has been that, other than big-ticket items, the military are generally tightwads concerning everyday things like office supplies and probably Col. Killian would NOT even *have* a 1970's-era typewriter on his desk, more likely something from the 1950s or 1960s. Not that this means a lot but it makes it even harder to believe his typewriter could have produced these memos.
There's a reference on one of the threads (sorry, don't recall which one), which describes the testimony of a co-worker of Killian sharing a clerk who did their typing. Neither of them ever typed anything at the NG.