In July 1943, 1./NJG 2 were back in Europe to undertake Defence of the Reich duties. On 2 July he flew his last operation in the south and NJG 2 relocated back northwest Europe. Rökker claimed his next victories on 24 August 1943 southwest of Berlin at 00:35 and 00:50, a Lancaster and Halifax, for his seventh and eighth. On 1 December 1943 Rökker was promoted to "Oberleutnant". The following month he was awarded the Front Flying Clasp of the Luftwaffe in Gold () for 100 night fighter operations. In February 1944 Rökker claimed two successes over Berlin as Bomber Command began a five-month campaign against the German capital. On the 24 February 1944 Rökker recorded a Short Stirling at 22:43 south of Heilbronn. The following night he claimed a Lancaster at 21:43, west of Hagenau.