Do you think the military will one day allow it?
The military will allow anything its civilian political bosses order it to allow. Commanders may balk and bitch about it at first—like many of them did over gays in the military or women in the infantry, etc—but ultimately they’ll have to toe the line.
If it’s going to happen, I don’t think it’ll happen soon. Maybe 5 years at the earliest, probably more like 10. But all contingent upon politics.
Will it be harmful in the ranks? I don’t see legalized pot causing anywhere near as many problems in the military as alcohol does. And I doubt there’d be too many people who’d be stupid enough to risk getting stoned before a combat patrol. I can’t imagine being stoned during a firefight.
I knew some teammates in VN who smoked pot. But they kept it discreet, only did it during low risk hours. The only reason I know is because the few guys that did it let us know where they kept it—right thigh pocket—so if they got hit we could remove it prior to medevac so they wouldn’t get charged with a crime along with a Purple Heart.