True story:
At the interview stage of OASC I was asked how to tell the difference between the F2 and the GR1 (at the time). Having been a bit of a swot I went into detail on weapons and fuselage length/shape. The interviewer came back with "But what's the obvious difference?" <slight
pause> Then I replied "One's grey and one's camouflaged." To which I got a "Thank you" and we moved on!
I was a young civilian at the time - are you entering from the ranks or from outside the Service?