"Santa's checkride" joke

This is from my Uncle George, who's retired USAF. (US Air Force)
Santa Claus, like all pilots, gets regular visits from the Federal Aviation
Administration, and it was shortly before Christmas when the FAA
examiner arrived.
In preparation, Santa had the elves wash the sled and bathe all the
reindeer. Santa got his logbook out and made sure all his paperwork
was in order.
The examiner walked slowly around the sled. He check the reindeer harnesses,
the landing gear, and Rudolf's nose. He painstakingly reviewed Santa's
weight and balance calculations for sled's enormous payload.
Finally, they were ready for the checkride. Santa got in and fastened
his seatbelt and shoulder harness and checked the compass. Then the
examiner hopped in carrying, to Santa's surprise, a shotgun.
"What's that for?" asked Santa incredulously.
The examiner winked and said, "I'm not supposed to tell you this, but
you're gonna lose an engine on takeoff."