https://www.c-span.org/video/?c4938647/user-clip-vaccine-campaign-1961
Bozo The Clown ? at the 51 second mark
They used the gun for the vaccines we received in boot camp.
I got this one checked off in the early 70s! A great tool for rapid mass vaccinations of recruits!
(Didn’t even reward us with a smiling nurse. All done by scowling Doctor Draftees and “Corpse” men in training. )