I've been perusing a few manuals and noticed CID doesn't even wear rank on their gear. They're just designated as CID so rank shouldn't enter the picture when working. I did notice their chain of command is separate from everything else which has gotta help immensely.
Of course, people with aspirations of increasing rank or their "station" in life isn't restricted solely to Army life.
Of every one hundred men, ten should not even be here. Eighty are nothing but targets. Nine are real fighters, and we are lucky to have them, for they make the battle. Ah, but the One... One of them is a Warrior... He will bring the others back.
"Wrong door, buddy!"
Let no man's ghost say my training failed him.