Has anyone ever used (or had one used on them) a tampon as a combat bandage to plug a penetrating injury such as a GSW?

I've been following a couple of threads on a few webpages where members have been arguing about the use of tampons in combat situations. Specifically, one group claims to have used them to plug penetrating injuries (ie: GSW). The other side claims it never happened and is/was prohibited by policy. I never personally had to resort to it but we WERE trained during Combat Life Saver. I've also been told by multiple combat medics they routinely carried them in their kits and used them when necessary (I carried a few in my CLS bag as well). Logic tells me, "well, they are designed to absorb/stop blood flow so....." I was curious as to what the reality is.