There are more emblems than coats of arms used by Spanish Air Force units, air bases, barracks, aerodromes, Air Force General Headquarters, its dependent divisions and other organisms or centres. Air Force emblems first appeared in 1913 displayed on the front part of the fuselage but they were not official until the 1920s. Most squadrons created after the Spanish Civil War didn't have an insignia until 1954, one year after the Pact of Madrid was signed by Spain and the United States. Since then all squadron insignias except the symbol belonged to García Morato Group were replaced. The use of Air Force emblems and badges increased with the introduction of patches on Military uniforms during the decade of the 1970s. An order of the Chief of Staff of the Air Force to regulate the patches was adopted in November 1995. José Ramón Pardo Onrubia and Carlos Bourdón García's book about Spanish Air Force symbols said it would be appropriate to standardize emblems and badges of units centres and organisms.