The gents (?) in the 1950 Binbrook guardroom were known as SPs. Their baleful eyes would follow us little lads as a cat watches a passing mouse. In fact I first thought their title was bluddySPs as my father so referred to them: "The bluddySPs came up to the hangar today, they say you've been playing around the Lincolns again".
As if we would try to start a Merlin. Perhaps it was just as well that the trolley-accs were too heavy for nine-year-olds to handle.
We knew the Snowdrops as US military police. One look at their white-painted steel helmets will show why they were so named.