I seem to recall reading that Jewish servicemen were treated the same as anyone else for fear that to do otherwise might alert the Allies to the fate of civilians of the Hebrew faith. W/O Wiseman had, IIRC, escaped Germany or Austria and might have fared worse (as an obvious German speaker) than someone like Robert Stanford Tuck - who, despite being Jewish, probably struck the Germans in his POW camps as being about as 'British' as you could get.