The point I was getting at is that until the Marine Corps buys something big enough to carry weapons or an EW system, reconnaissance and "glorified artillery spotter" is where we're at.
We carry EW systems on MQ-21. We deployed with them this past summer and they are going out on the 15th MEU this month. We do a lot more as far as integrating with the rest of the ACE. We conduct our own versions of SCAR and CAS. We do a lot of aerial recce, we do a little arty spotting (though really, we roll that into terminal guidance ops as well).
But you are right, the Shadow was designed as an arty spotter. We're doing more with it because we can. MQ-21 has it's own capabilities. The next step is group 5 assets. The Army has a more capable airplane than the Shadow, but they still pretty much use it as a big shadow (160th guys are a bit different).