If you return to the FARP from which you launched, you get options to either refuel/rearm or end the mission. Be advised, any damage will not be repaired, you'll only be refueled and rearmed to the extent your helo is capable of using (i.e., damaged right weapons pylon and you'll only get enough armament to restock the functioning left pylon). The manual says if you land at any other FARP than your last waypoint, you can refuel, but it doesn't indicate you can rearm.
Ctrl-C resets Master Caution, thereby turning off warnings. Nice to be able to silence Betty so you don't have to listen to "Left Engine Out, Hydraulic Failure, Oil Pressure Low" all the way back to the FARP. Once you've heard it, it gets old (and distracting) real quick, so resetting Master Caution is how you do it.