From the depths of my seventeen-year-old smart-alecky mind, we have an attempt at holiday humor.
Just think! If Santa and his troops invaded an Army base to militarily enforce Peace on Earth! And what if one of the elves, assigned to pull a missile on its trailer out from its hangar into the open, decided instead to take a nap underneath it. So what if Santa came in and caught the guy snoozing under the trailer and asked him what the elf was doing! What would the elf say?
"Just hanging around under the missile tow."