Military movements don’t usually show up on things like FlightAware but they can make an appearance on FlightRadar24 or ADSB Exchange. I hadn’t been checking either of them as I was getting ready to leave when one of the other people nearby let me know a C-20 was inbound. It turned out to be a C-20G from the US Marine Corps. I’m usually happy to shoot a Gulfstream but one in military markings is a bit more unusual and the Marine Corps even more so. Glad to have had the tip not to go too soon.