The only difference between the North American P-51B and C variants was the B was built in Inglewood and the C in Dallas. The B variant first flew on May 5, 1943 and the C variant first flew on August 5, 1943. The B variant saw 1,988 built while the C variant saw 1,750 built. On December 1, 1943 the P-51B Mustang flew its first combat mission and in March 1944 provided bomber escort to Berlin. The high shape of the P-51B/C dorsal spine gave it the name “Razorback”.