 He continued to score against German fighters and remain a leading ace after the 352nd transitioned to the North American P-51 Mustang and adopted their famous "Blue Noses".By November 1944 he was deputy commander of the 352nd Fighter Group and the fourth highest scoring American ace in Europe with 24 confirmed air-to-air victories and 13 destroyed on the ground.In December Meyer, as a Lieutenant Colonel, deployed with the 352nd to a forward base in Belgium designated "Y-29".