You were missing my point - The fact is right now about everyone in theater (especially in Iraq) are all "door kickers" (be it Marines, 101st, 82nd, 10th Mtn, etc, etc).
But those are true "shooters" in the since of the word to what I am referring (along the lines of what SEALs and Delta are tasked with within the SOF community).
MARSOC which will be an asset of SOCOM will fall into a lead role outside of that of which the other "conventional" forces are currently doing (and that of their non-SOF titled Marine brothers).
Do Rangers conduct and run their own Ops designed and tasked solely to them within the SOF - Of course they do. As will MARSOC if called upon.
But Rangers also have the large task of providing the QRF for most SOF operations along with perimeter security. This is what MARSOC will be tasked with as well (and often taking this role for the SEALs).
Regards,