Sexual harassment in the workplace is generally guided by EEOC regulations, but it is not criminal. If this was on a USO tour, there is no "business" or "employer" to file charges with, is there?
Beyond that, it becomes criminal when there is physical abuse taking place. In this case, the imagery of groping exists, but she's wearing a flak jacket and Kevlar vest, too, so the physical harm is a hard charge to make.
That leaves it back with hostile workplace charges. Simple one-time teasing usually does not rise to the level of a pattern of harassment unless it is egregious.
So this might end up being a matter of two adults settling the score on their own.
-PJ
Franken is a POS, I get it. But principle is principle. We shouldn't be entertaining this crap because once Pandora's Box is open, men will be defending themselves against accusations that cannot be proven, like Judge Roy Moore.