John Stone is an adventurer.
That probably sounds a lot more dashing than being a bartender, though the tips are certainly better as the latter. Stone would know because when he feels like it, behind the bar is where he often stands, being part-owner of the 'Fox Hole'. I chose the 'adventurer' identification because no other option seemed better and this one at least alludes to the fact that Stone can and does drop everything when something important (and dangerous) pops up. And that, from the number of adventures we have of him, is not uncommon.
Stone is described as having "weathered and worn hands of a blue-collar grinder" with a "barrel-chested build", built "while fighting for the freedom and security of his countrymen as an Army Ranger". Though that was now several years in the past, Stone took pride in maintaining his strength and his fitness. He wore his brown hair in a close-cropped flat top style and possessed "piercing eyes and a rugged appearance". "A thick mustache that covered his top lip separated his chiseled granite jawline and cheekbones, ending just at the corners of his mouth. His head sat atop a powerful neck that started at his ears and splayed out like a pyramid." All this made this occasional bartender perfect for when also needing to be an occasional bouncer. It also comes in very handy when Stone leaves the darkened saloon for far more dangerous locales.
These 'side projects' that call for his attention now and then will often involve groups out to either bring down his country or try to take it over, hence his membership here. That might bring him into close contact with officialdom both nationally like the CIA and locally like different police departments but he does a pretty fair job of playing nice with them while remaining very much his own man.