In 1975, my dad was an Air Force Colonel. His secretary had a 1918 Underwood typewriter.
My recollection was that we had mostly manual Remingtons, Top Sargeant was purported to have a Royal electric that made a noise like the starter motor on a Detroit Diesel when turned on.
Al Gore used a focused ion beam down an intergalactic worm hole to reconstitute the Underwood typewriter at the other end into an IBM PC with lazer printer