Did you ever have someone you truly wanted to beat up during your military service?

Someone who made you wonder, "Why on earth is this person going this far against me?"
Or is there anyone here who acted that way themselves and is currently reflecting on it?
(Though, I suppose those kinds of people aren't the type to reflect)
Looking back, I don't think there was anyone that hopeless in my company, but then again, I was a recent enlistee..