First "Blue Squadron" was assigned to JG 27 in September 1941 as 15.(span)/JG 27. After JG 27 departed for Africa it went to JG 51 (retaining the 15. Staffel designation). When it was withdrawn to Spain in 1944 it had been the fifth so-called "Escuadrilla Azul" (meaning the squad crew changed five times).
