Becker scored his first victory on the night of 23 September 1943 at 23:21 south of Hameln. In October 1943 Becker was appointed to "Staffelkapitän" (squadron leader), 2./NJG 6. Becker shot down three bombers on the night of 18/19 November 1943 as RAF Bomber Command began their Berlin offensive. Becker claimed a Short Stirling at Lampertheim at 20:44. Southwest of Mannheim he claimed a Handley-Page Halifax destroyed at 20:56 and another near Rimbach at 21:05 for his second to fourth victories. Becker achieved ace status on 21 December when he claimed one Avro Lancaster bomber two Halifax between 19:50 and 19:55. On the night of 20 February 1944 Becker downed three bombers—two Lancasters and a Halifax—between 03:02 and 04:18 in the airspace between Celle and Leipzig. One of the Lancasters may have been "JB469" EA-B from No. 49 Squadron RAF. Pilot Flight Sergeant E. White, Sergeants J. R. Ward, W.W. S. Compton (navigator), J. E. Ellis (radio operator), D. N. Stevens, J. T. Loveland, and H. Thomas were killed in action. The Halifax was "LV834", and belonged to No. 35 Squadron RAF. Pilot, Flying Officer Randal Vincent Jones was killed with four other men. Two men included Horatius Douglas Stewart White DFM, were captured.