FFP: the mandatory 'US PT gear' is roundly and deeply resented in the USAF. As is the PT itself...
A mate was once on exchange on the AV-8 with the USMC. When invited to participate in some distasteful jogging around the base with the rest of the jarheads making '1-2-3-4, 'nited States Mreenkaw' noises, he affected a pained expression, before commenting "Run? RUN? Oh dear me, no. You see, old chap, British officers don't run - it would panic the troops!".
He also told them that he was quite capable of waxing their backsides at ACM without the need to spend hours lifting scrap iron in some gym - as he indeed proved on several occasions!