Sebuah pedang miring dengan ujung menghadap ke atas, memotong simpul tali (reef knot)[2]
Kode skuadron
NF (Agt 1941 – Mar 1945, Apr 1947 – Sep 1950)[3][4] AC (Mar 1945 – Apr 1947)[5]
Skuadron No. 138 RAF adalah sebuah skuadronRoyal Air Force yang mengemban berbagai peran sepanjang sejarahnya, dan terakhir kali dibubarkan pada tahun 1962. Skuadron ini merupakan skuadron 'pengebom-V' (V-bomber) pertama di RAF, yang mengoperasikan pesawat Vickers Valiant antara tahun 1955 dan 1962.
Bowyer, Michael J.F. and John D.R. Rawlings. Squadron Codes, 1937–56. Cambridge, UK: Patrick Stephens Ltd., 1979. ISBN0-85059-364-6.
Flintham, Vic and Andrew Thomas. Combat Codes: A full explanation and listing of British, Commonwealth and Allied air force unit codes since 1938. Shrewsbury, Shropshire, UK: Airlife Publishing Ltd., 2003. ISBN1-84037-281-8.
Halley, James J. The Squadrons of the Royal Air Force & Commonwealth 1918–1988. Tonbridge, Kent, UK: Air Britain (Historians) Ltd., 1988. ISBN0-85130-164-9.
Jefford, C.G. RAF Squadrons, a Comprehensive record of the Movement and Equipment of all RAF Squadrons and their Antecedents since 1912. Shrewsbury, Shropshire, UK: Airlife Publishing, 1988 (second edition 2001). ISBN1-85310-053-6.
Moyes, Philip J.R. Bomber Squadrons of the RAF and their Aircraft. London: Macdonald and Jane's (Publishers) Ltd., 2nd edition 1976. ISBN0-354-01027-1.
Rawlings, John D.R. Coastal, Support and Special Squadrons of the RAF and their Aircraft. London: Jane's Publishing Company Ltd., 1982. ISBN0-7106-0187-5.
Rawlings, John D.R. Fighter Squadrons of the RAF and their Aircraft. London: Macdonald & Jane's (Publishers) Ltd., 1969 (2nd edition 1976, reprinted 1978). ISBN0-354-01028-X.
