How to stop compulsive laughing?

I'm going to officer training at west point after I graduate high school. But I have the weirdest laughing problem. Every time something is said that isn't funny, I laugh. Anytime that a joke that is or is really funny is said, I can't control my laughter and I look like an idiot. I can't close my mouth or stop laughing even if I try forcefully with my hands. Any tips on how to bring it down to a controllable level or make it stop? I don't want to be the idiot who laughs at everything my instructor say's and have a bad reputation in school for looking like a laughing psychopath. Any help is Thanked warmly.
Asked Apr 13, 2014

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