MR LAX
When someone like you goes as a policeman into another country you pretend to be somebody besides yourself, you pretend to have an occupation or some description, you pretend - or no occupation as the case may be, but you certainly create what in Afrikaans is called "'n legende", what in English is called "a cover story" or "a legend".  I'm really surprised that you've never heard these terms before or you don't seem to understand them.  As someone who was a field worker in Lesotho it puzzles me that you don't understand them.