ACHTUNG
>>3644636
Have a poorly drawn comic.
>>3644636
>I'M LEAVIN!
>>3644636
SPION!
>>3644636
I've never been able to hear the regular guard alert noise as anything in particular. It certainly doesn't sound like "ACHTUNG" to me. It's spoken like two separate words and the second bit doesn't sound like "TUNG" at all.
>>3646010
Probably because the voice actors weren't German and couldn't pronounce it properly.