Mine is from work. 24 years on the NYSE trading floor as a specialist clerk, arbitrage phone clerk, and finally as a specialist. When I first began on the trading floor I was a summer intern, filling out my resume and earning a few bucks until my slot in Marine Corps OCS/Flight opened up. Everybody got a nickname and mine became "Rambo" since I was joining the military. The Marines never happened for me (less than perfect eyesight ruled me out of the Flight program) and I ended up keeping my "temporary" summer job for 24 years. When I became a member of the NYSE and a specialist for my firm the last two digits of my trading badge were 47. When I got an AOL email account,
rambo@aol.com was taken, so I had to add the digits. Rambo47 has been the online name I use ever since.