The Royal Air Force is celebrating its 100th anniversary this year and we thought there was no better way to celebrate than to put your RAF knowledge to the test.
We're halfway through our quiz asking you 100 questions about the world's most iconic airforce.
Thought the last few rounds were too easy? We've asked veteran reporters, presenters and engineers from BFBS and Forces TV to send us the most perplexing questions they could come up with.
Just click below to have a go and see if you can 'suss out' this tricky brain-bending quiz.