A couple of months ago I was near the Wallops Flight Facility in Virginia, when I saw 3 or 4 planes flying in a tight circular pattern. The planes were on the larger side, prop driven and had large radar dishes mounted to the top of the fuselage. Based on that, I'm guessing they were E-2 Hawkeyes of some variant. I don't remember the livery, unfortunately.
The planes were flying roughly 200ft above ground level. They were all on the same rough flight path, and were circling. The circle was probably 0.5 to 1 miles in diameter. The flight was right over the eastern edge of the base. I didn't see the planes take off or land, but in the time I was watching, they probably flew 4 revolutions.
At the time I was guessing that the planes were flying like this because they were doing some sort of weather detection, but I was wondering if any of you could provide me with a more definite answer. So my question is:
What was the purpose of having those planes circle the area?