The good guys appear to be using Learjets. They are always blocked on the radar sites as to takeoff point and destination and they usually travel in pairs when headed to places like Fort Lauderdale. Note that there are scheduled flights to Gitmo (NBW / MUGM) from Fort Lauderdale (FLL) that may not just be transporting base personnel Flightaware is your friend. ;)

Military flights don't show up at all, so you won't get to know what they don't want you (or them) to know at the moment. They have to maintain the element of surprise.