Police records reveal the close relationship between the Minneapolis police department and the U.S. military.

Public Record Media, a Minnesota-based nonprofit organization that uses freedom of information laws to obtain and publish government records, has released documents showing how the Minneapolis Police Department and the Minneapolis city government worked hand-in-hand with the Pentagon to conduct counter-terrorism training operations in the city without informing the public.

The August 2014 exercise included ground operations and low-flying black helicopters and fixed-wing aircraft. Training specifics included "low visibility movement, low-altitude precision helicopter operations, surveillance, and counter-surveillance."

The U.S. Navy sought to keep a low profile. "This is a highly respected and security sensitive effort," Minneapolis Police Department Deputy Chief Edie Frizell wrote in an email. "The training was conducted in 2012 in Minneapolis with little or no fanfare – that is the way they want it."