In 1943 the squadrons of the 1st Fighter Group began to apply distinctive colors to their tailbooms, wingtips and propeller tips for rapid unit identification. This was in addition to the fuselage letter codes assigned to the group by the Eighth Air Force which it continued to use when reassigned to the Twelfth Air Force in November 1942. The 27th FS used red (squadron code HV, radio callsign PETDOG), the 71st FS used white (squadron code LM, callsign CRAGMORE), and the 94th FS used yellow (squadron code UN, callsign SPRINGCAP). When the group began receiving P-38s in an unpainted aluminium finish in the spring of 1944, the 71st changed its color to black. Red spinners were also introduced sometime in 1944 to the entire group. During the time of the North Africa invasion, the national insignia was outlined in yellow, replaced by a star-and-bar outlined in red in early 1943. From May 1943 on the standard star-and-bar national insignia was used.