St Peter's at the Pearly Gates. He spies three blokes at the front of the queue. St Peter looks at the first first one,
"What did you do mate?"
"I was in the RUC."
"The RUC, that's fantastic! Out the back is a bit of a sectarian riot. Get in there, sort it out and afterwards I need you to investigate some terrorists who are running guns up from Hell." Off runs the RUC officer to break some heads.
St Peter asks the second man, "What did you do?"
"I was a Met police officer."
"The Met, that's fantastic! Down the side is a bit of a race riot. Get in there, sort it out and afterwards I need you to investigate some Yardies who are smuggling drugs up from Hell." Off runs the Met officer to sort it all out.
St Peter then asks the third bloke, "What did you do?"
"I was an RAF policeman."
"An RAF policeman, that's fantastic! Guard the gate whilst I go and have a pee!"