We had several people ask us what that military jet is, that is flying around the area today.
It is a military KC-135 with the callsign UPSET51.
They fly into the Rockford area often and practice maneuvers and touch-n-go’s at the Rockford Airport. If I recall, they are based up in Milwaukee and train a lot in Rockford.
You are probably asking what a KC-135 looks like and the purposes of it?
I was able to take the photo below awhile ago,
The photo was a KC-135 landing at the Rockford Airport.
The Boeing KC-135 Stratotanker is a military aerial refueling aircraft. It and the Boeing 707 airliner were developed from the Boeing 367-80 prototype. It is the predominant variant of the C-135 Stratolifter family of transport aircraft. The KC-135 was the US Air Force’s first jet-powered refueling tanker and replaced the KC-97 Stratofreighter. The KC-135 was initially tasked with refueling strategic bombers, but was used extensively in the Vietnam War and later conflicts such as Operation Desert Stormto extend the range and endurance of US tactical fighters and bombers.
The KC-135 entered service with the United States Air Force (USAF) in 1957; it is one of six military fixed-wing aircraft with over 50 years of continuous service with its original operator. The KC-135 is supplemented by the larger KC-10. Studies have concluded that many of the aircraft could be flown until 2040, although maintenance costs have greatly increased. The aircraft will eventually be replaced by the Boeing KC-46 Pegasus.