Philip W. Cholak Profile: Philip W. Cholak Events (2) Shortly After 9:37 a.m. September 11, 2001: Park Police Aviation Unit Promptly Responds to Pentagon Attack 2001-09-11 (Shortly After 9:55 a.m.) September 11, 2001: Park Police Helicopter Given Air Traffic Control Responsibility for Washington Airspace 2001-09-11