Universal Music Group | Warner Music Group | Coxeter group | Volkswagen Group | Group of 77 | RTL Group | girl group | BT Group | ABB Group | Group One | Virgin Group | Thales Group | ING Group | group | Rio Tinto Group | Bloomsbury Group | Penguin Group | Carlsberg Group | Borders Group | Arup Group Limited | Benetton Group | Stagecoach Group | LMFAO (group) | Anschutz Entertainment Group | Tata Group | Rootes Group | Westfield Group | The Pursuit of Happyness | Group races | Group C |
Born in Guthrie, Oklahoma, he joined the Air Service, United States Army in 1917 during World War I. After pilot training in the United States, Lieutenant Robertson was assigned to the 139th Aero Squadron, 2d Pursuit Group, First Army Air Service.