Fuel will form gummy and sometimes hardened deposits when it sits for a while. Sounds like whatever fuel was left in your carb, and it doesn't take much. Has done just that. The reason that fuel is leaking out of the carb is because the float is stuck down and not rising to stop the fuel when the bowl gets full as it should. The reason that it won't start is probably because the jets are clogged. What you need to do is take the carb off the bike, take it completely apart and clean EVERYTHING, every nook, cranny, crevice and passage. Torch tip cleaners, carb cleaner, wire brushes and compressed air will be handy.
Good luck, and thank you for your service to our country.
Yours truly, sincerelly, love always, Josh aka The DirtDemon.