1st off, they take and charge people like you, so you will cave and narc your friends out...In a case like yours, it is common that the judge will insist the prosecutor in a case with no evidence, like yours, to drop it, and not waste the courts time. that's what happened. Most likely they hoped you would roll over, but you didn't and they let you go away, rather than embarass the court with sketchy charges at best. Good luck.
By the way, If you still join the military; You better clean up your act, because, even though you can probably get away with doing a little dope from time to time...If you get caught in the military getting stoned...Your ass will be in the brig, they will bust your rank, and if you are the scapegoat, or the commandant wants to make an example for the whole base; then your ass will be in leavenworth...
have anice day, since you can. lw