 "Gruppe" of JG 2 "Richthofen" in November 1942.On 23 November, Mayer claimed his first victories over United States Army Air Forces (USAAF) four-engined bombers, when he shot down two B-17 Flying Fortresses and a B-24 Liberator.Together with Georg-Peter Eder, Mayer developed the head-on attack as the most effective tactic against the Allied daylight heavy combat box bomber formations.