Personally from my military perspective, and being a newb, I will tel you that while it does does like MILSPEC, meaning the military says it's safe....not the gov't. THAT being said.....if it is real PLA or milpsec for that matter. It should have the head phones built into the ear cones.....not saying those cheapies wouldnt take them out but they should have them in there.....if there not?
Try pinholing the bottom of the ear cone then pushing hte ear buds through. It is possible you could find some sort of wire soffet at radio shack for the wire after you run it through to keep it from falling out if pinholing doesnt work.