[Bearkiller72]

Perhaps more related to the discussion at hand is the use of Zwo rather than Zwei for the numeral "2" in German radio or telephone communications (avoiding confusion betweween Zwei and Drei, 2 and 3) Can someone confirm that usage in German/Luftwaffe communications?

Nope, as for your question. But "Zwo" is a rather common practice of naming the digit "2" in German, even today. Even in everyday, civilian use (at least where I come from).