I roundly ignore that last line. Just because half the population doesn’t know British English is no reason to pander to them!
Next they’ll be telling us that we can’t call it “Soccer” because they think that’s an Americanism too…
Which is an odd one, as JSP101 uses the -ize suffix.
But I like -ize, it’s a good way to trip up amateur pedants.
HOWEVER,
I’m going to have to go against @wdimagineer2b here - Air Cadet Organisation is a proper noun, and thus there is only one correct way to spell it. Given that the organization uses the -ise suffix, that is the only correct form.
Ahh something else that hasn’t been thought through or completed fully!!!
I presume that they are trying to wait for the next disaster and under the cover of bad news, release this?
Not recently I hope as I’m sure in the latest revision (that we can see on BADER) that you’re allowed to do that…
Edit: yup, see below from Feb 17 version 2.00
b. Short Sleeved shirt (Uniformed Adult Staff only - Not to be worn by Cadets). Only the Service issue short-sleeved wedgwood blue shirt is to be worn with No 2B SD. It is to be worn with creases pressed in on each sleeve running from the centre of the epaulette to the sleeve end. The short-sleeved shirt may be worn under a jersey with the mandatory addition of a tie.