Yes you can quit. So don't worry about it. Im in the reserves right now for the navy so maybe you might want to look into that? It was a love/hate relationship with me regarding the navy so I decided to go reserves. The benefits are still good and you only go once a weekend and two weeks a year...
I was active duty in the US Navy for a total of five years on board the USS Kitty Hawk and I remember that we had an outstanding sailor who came from Poland who did not speak a lick of english. They had a special school he had to go to either before or after bootcamp to understand the English...