Tests that look for gear are very expensive. I'm sure the military has better ways to spends its money.
I'm not in the military, nor have I ever been, but I will bet my scrotum's contents that military tests aren't looking for AS.
In addition to the money issue, I'd have to say that the military wouldn't want to test for gear. Why the fuck would the military care if soldiers were using a drug that would make them physically superior? They should condone gear use.