We are mandated to have them on our belt line by our Unit SOP, (USMC Infantry Rifle Company) Our policy states that they are only to be used for magazine retention and SSE, yet many violate this and tend to try to use it as their big catch all pouch, This can lead to issues, as the Company GySgt, I don't have a issue with guys using it to hold their gloves, inner belts, Eye/ ear pro, Slings to make sure they keep all their shit together, but one they are jocked up then the pouch has to be empty so it can receive empty mags. Part of the reason for this for me is that since we spend much more time running downrange, getting into the prone and then bounding forward and such that I will see a trail of empty mags and personal bits from guys with a dumper filled with bullshit, ain't no one got time for policing up all that stuff, but the guys who start out with a empty pouch tend not to lose their mags to the range monster. As much as I want to think big Marine Corps will get replacement mags to us again in combat, my experience has been that it will take some time for them to show up so you have what you have brought ashore with you. With our renewed emphasis on distributed operations and amphibious landings we are becoming very conscious of weight and logistics shortfalls...… ( well some of us anyways) SWAT and DA guys have a different perspective I would think, as a lost empty will just be replaced before the next mission or hit in the rear. On my personal rigs I use for classes and training I have them installed and use them to bring extra stuff to the line and find them highly useful as a catch all pouch, but I'm not nearly running around as much in those classes as I am for light Infantry shit. My "greenside/ tree line" rig is more a Belt kit style rig ( as close to brit style PLCE as I can get it using Coyote kit) these days anyway and I am using a old school modified SAW drum pouch with a slit and flap cut in the top cover as a dumper behind the two triple mag pouches on my weak side. It is located over my right rear pocket, same location as a dump pouch is normally located.