Jan. 19, 2021 2021 C2 Summit Enhances Air Force Contribution to Joint All-Domain Command and Control The Air Force’s annual Command and Control (C2) Summit was held at Nellis Air Force Base Jan. 12-13, 2021. Led by Gen. Mark Kelly, commander of Air Combat Command, it highlighted joint cooperation as leaders worked to modernize and standardize the processes for Joint All-Domain Command and Control