7 low flying, in formation aircraft seen over Bloomington, IL.I was driving southbound on Towanda Ave, over the railroad bridge off of Ft. Jesse Rd. my son and I witnessed 7 black objects flying in formation about 1000 ft off the ground. They were flying from northwest to south east in a rapid manner. At first, I thought they were Chinook helicopters as they routinely fly over head. However, being a 16 year vet of the Army, I've never seen Chinooks fly that fast and never in that close of formation. Also, the profile seemed skinnier than that of a Chinook. I heard no noise as is typical with Chinooks even at the distance, about a mile out, from my position. It could be drilling aviation unit, but I'm not certain that it was.