And who are you to say Bulk Fuel is a lame MOS? The Corps has a need for every MOS we have. Some people are MARSOC, some are cooks, and some are bulk fuel. It may be lame in your opinion, all the way up until you need fuel. The reason Bulk Fuel (and cook, or MT) are the best answers when people ask "what do you do?" is they invite very few questions. Not because they're "lame" MOSs.
We used to put up bulk fuel signs around our camp for exactly the reason 0699 mentioned: OPSEC. Force Recon isn't a classified unit with a cover story but we tried to maintain a low profile. We used to set up our camp next to the motor pool and throw up a sign that said bulk fuel. We used to have guys snoop around the Force Recon compound for whatever reason but no one snoops around the bulk fuel compound.