Schultz: [To Hogan about Newkirk in a Gestapo uniform] I must report this. It would be worth my life if I do not report this.
Hogan: It's only until tomorrow. He's gonna take it off again.
Schultz: Aahhh.
Hogan: After he steals the tank...
Schultz: Ohh?
Hogan: from the Panzer division...
Schultz: Ohhh?
Hogan: and brings it here into the barracks.
Schultz: Oh, I see nothing, I was not even here, I did not even get up this morning.
Top Hat, White Tie and Bomb Sights - S1-E10
Burkhalter: Colonel, may I remind you, that we are here on official business?
Klink: Official business, yes. Monkey business, no!
Answer: Nimrod's actual identity was never revealed in the series. It was only known that he was a British intelligence agent. Nimrod was not Colonel Klink. Hogan had only implied it was him as a ruse to get Klink returned as camp commandant, not wanting him replaced by someone more competent who would impede the Heroes war activities. (As another contributor previously posted, the term "nimrod" is slang for a nerdy, doofus type of person, though it's unclear why that was his code name).
raywest ★