Well, we don't always wear a helmet in the field, we have a bushcap too, but that is for situations that don't require a helmet... But when you have to do an operation like a raid or direct action on a target, you always wear a helmet, the days of going on a fighting patrol through the woods I think are over, the only time you will do that now is an approach march to a built up area, lets face it, most battles are going to be fought in urban areas from now on, because noone can challenge a force like the U.S. or UK on open ground, not with their tanks and aircraft... If you look at Iraq, it was a fast hard move to an urban area, then a dismount and then aggressive patrolling through city or oilfields... It is SOP to wear helmet in most armys while in the vehicle too, so I think you bushcap or beret will stay in your map pocket for most of any battle, you will then wear it later in less threatening situations... As for identity, well, thats fine in garrison, showing off your colors, but in the field the less you show off the better.