The top ranking Air Force General and his predecessor are under federal investigation for allegedly steering a contract for the aerial performance Thunderbirds to a friend, who is a retired Air Force General, according to Reuters:

The FBI investigation began after complaints from Air Force insiders and a rival company whose bid was for half the amount, the network said.

The contract was canceled earlier this year when the Air Force General Counsel questioned the “integrity of the process” and the involvement of four-star generals, ABC said.

The case was referred to the Inspector General for the Department of Defense, and the FBI later joined the investigation, it said.