Somebody posted a video of it on youtube...
http://www.youtube.com/watch?v=z3GNVvhh5Ww&feature=player_embedded#!
Weather balloons, tethered together and to the ground station.
Yep, that’s it.
A friend who works for the AFRL told me before I could finish asking that it was a weather balloon. With a funny smile on his face.
I think it was us testing something.