"Policeman" joke

St Peter is standing at heaven's gate when a man walks up.
"Welcome to heaven my son. What did you do with your life?"
"I was a policeman," he responded.
"What kind of policeman?" St Peter asked.
"I was a vice officer. I kept dangerous narcotics out of the hands of kids."
"Wonderful my son, welcome to heaven. Pass through the gates."
A few moments later a second man walks up.
"Welcome to heaven my son. What did you do with your life?"
"I was a policeman," he responded.
"What kind of policeman?" St Peter asked.
"I was a traffic officer. I kept the roads and highways safe for travelers."
"Well done. Pass through the gates into paradise."
A few moments later a third man walks up.
"Welcome to heaven my son. What did you do with your life?"
"I was a policeman," he responded.
"What kind of policeman?" St Peter asked.
"I was a Military Policeman, Sir."
"Excellent my son, I have to leave for a bit, watch the gate will you?"