obedience monkey
A person who's so used to taking orders they don't even question them. Not even when the orders are dumb or don't make sense.
I was told to sit in the corner for an hour. I did. Even though I had no idea why.
My boss told me to print out a document 50 times. I did. Even though it was the same document.
The commander said to shout 'yes sir' until I was blue in the face. I did. Even though I was already blue.