The strangest "qualification" request I ever heard was from a Doctor (A Major) at NaTrang SF Base in Vietnam. He had just arrived and gave his orders to the Sergent checking in everyone. He was due to travel to Saigon to the definitive care unit.
The Sergent obviously didn't look at the orders nor very closely at the mans medical or rank insignia. He did notice that the Doctor didn't have a weapons qualification badge and asked if he was qualified to shoot a weapon, because, "In Vietnam, you need to know how to kill the enemy". ::)
The Doctor gave him a great, "What a moron look" and replied, "Sergent, I'm a Doctor and I am Major. I am highly qualified in the proper procedures for the use of firearms and I know the precise locations to shoot someone to kill them. Would you like to see a demonstration?"

The Sergent had a great, "Oh $hit" look and ushered the Major quickly to his Huey for transportation in country. ;D