Then file the complaint when it happens. To give this credibility opens this up to us becoming a nation of law suits of childish crap that happened years ago.
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