There are various models in the 757-200 series, 223, 222, 232, 230, 251, 2B7 etc. I'm not sure however if there is any significant difference between these models.
Anyway, my point is that Flight 77 was not a 232 but a 223.
All the 223's I have seen have 8 holes in the landing gear.
At least some of the 232's have 10 holes, see this pic of a 232:http://www.planepictures.net/netshow.php?id=457843
So the issue of the wheel rim at the pentagon it is somewhat more complicated than it at first looks. In any case, my area of focus would be finding an image of a global hawk with 8-hole wheels.
Somewhat tangentially, I find it mildly interesting that if you search for pictures of a 757-223 (flight 77) on the major plane pictures websites, there are ONLY pictures of AA planes for that model.
For example, a search for images of a 757-223 on jetphotos.net, airliners.net and planepictures.net brings up several hundred images and ALL of them are AA planes. I suspect that these three websites are all run and owned by the same person/people because they are strangely similar to each other, but it amounts to a monopoly of web pics of planes on their part and they only offer images of AA versions of the Flight 77 plane. I smell a operation...