No. 201 Flight
... that No. 201 Flight's role was considered so secret by the Royal Australian Air Force that few people outside the unit knew that it even existed?
... that <b id="mw1A"><a href="./No._201_Flight_RAAF" id="mw1Q" rel="mw:WikiLink" title="No. 201 Flight RAAF">No. 201 Flight</a></b><span about="#mwt15" class="nowrap" data-mw='{"parts":[{"template":{"target":{"wt":"`s","href":"./Template:`s"},"params":{},"i":0}}]}' id="mw1g" typeof="mw:Transclusion"><span typeof="mw:Entity">'</span>s</span> role was considered so secret by the <a href="./Royal_Australian_Air_Force" id="mw1w" rel="mw:WikiLink" title="Royal Australian Air Force">Royal Australian Air Force</a> that few people outside the unit knew that it even existed?