Yellow Fever
FWIW,
IIRC; One of the many jabs I was given on enlistment in 1971 was for yellow fever. It was good for 10 years as I recall, then a booster was required.. When I was posted to Gan, I was given another, regardless.
It was a very long time ago, but the memory of shuffling in line with sleeves rolled up, past medics standing on either side of the line armed with needles administering 1 in each forearm, 1 in each upper arm, will live with me forever.
TB