Jim Fisher wrote:

What is the etymology of Tango Uniform?

I'm guessing "tails up" or "tits up" but anyone know for sure?

I have always heard it as Tits Up as a description for dead. If it were
"toes up" or "tails up", there would be no need to "sanitize" it.

It's my understanding that the police are now using DRT to describe a
dead perpetrator. That means Dead Right There.