Green men

We have a laugh every day at the Fidelity Guard that comes to get the cash. They're always men and come at unpredictable times every day. It's usually a different guy every few days, but we've gotten to know all of them now already. They are known to us as the "Green men". I can't see when they park outside, so inevitably there's always a colleague warning me by shouting: "The green man is here!".
For a while we had one that would run everywhere. It was actually funny. He would park and run all the way into the shop and back again. Once he forgot something in the van and ran all the way there and back.
When I get summoned to open the safe by a colleague it's usually accompanied by a: "Don't worry, it's not the running one." or "Quick, it's the running green man!".
Some are very talkative: they want to know how business is going and who our clientele are. Others just say Hi and do what they gotta do. For a while I got rather scared being stuck in an office with a stranger packing a pistol, but I've since gotten used to it.
Yeah, the green men really have a crappy job. Talk about high risk (one was shot just outside the shop a few months ago)! And they probably don't even get a salary that reflects the dangerous nature of their work.
Somehow these nameless green men have really become part of our daily lives.