Got a good vaccination dit from many years ago.
My first tour was in Sharjah, and a couple of mates were lucky enough to grab indulgence flights to Singapore and/or Hong Kong. For which the yellow fever jab was required.
One of the mates had one - think it was 10 years worth then - so the other trudged off the the Army Medical Centre, who were the only people on base who had the vaccine. Mate sees Army doc, who then discovers that the yellow fever jab comes in a bottle with two jabs-worth. Not wishing to waste one, doc opens window and calls to a passing soldier.
"Soldier - have you had a yellow fever jab?"
"Nossir!"
"Well get your arse in here - you're having one now!"
Would probably be called assault nowadays........