 Complete the following phrase:  On 22 July 1942, the Geschwaderkommodore of Jagdgeschwader 52 JG 5252nd Fighter Wing, Major Herbert Ihlefeld, was severely injured in a flight accident and had to surrender command during his convalescence. At the time, all three Gruppen of JG 77 were lent out to other units, and Gollob had time to spare, so temporarily took over command of JG 52 as acting Geschwaderkommodore. On this or one of the following days, he departed and flew to the Geschwaderstab of JG 52. On 28 June 1942, the Wehrmacht had initiated 