I have this sudden image of Jet et al. as street sweepers and Jet getting violently mad when someone litters and shaking his fist.

Or they could be resurrection men for Ba Sing Se University's autopsy theater! It's illegal, gruesome, the pay stinks, sounds like Jet's kind of work! Also, it's almost always done in small bands of two or three.

Or they could be pigeon-rat catchers. They're good with traps. Nah.