...would you have expected an incoming "high and tight"-styled US exchange officer to grow his hair out to a more respectable length?
Sir, Hell No, Sir! It would have reduced our opportunities to take the pi$$.....
There was a USMC exchange navigator on 228OCU when I did the F-4 course. Thoroughly nice chap - but he was rather taken aback when we were about to have some visit, for which B*****d B*ll had decreed No1 HD would be worn, when one of his rather rude staff colleagues asked "Does that mean you'll have to turn up in your Glen Miller lookalike outfit?".