service. These flags are the heraldic standards (estandartes heráldicos), the guidons (guiões) and the heraldic pennants (flâmulas heráldicas). The heraldic standards are square flags (1 m × 1 m), whose fields may be blazoned with a combination of ordinaries, crosses, stars or stripes, with an optional cross or saltire overall, the fields having in the center the shield of the bearers surrounded by a scroll with their designation. The guidons are also square flags (0.8 m × 0.8 m), the field charged with the heraldic badges of the bearers, with a bordure that can be simple, gyronny, quartered or cantoned. The heraldic pennants - not to be confused with the commissioning pennants - are triangular flags (0.75 m × 0.25 m), divided in four parts by a scroll in bend with the name of the bearers and charged with their heraldic badges. Heraldic standards are borne by the Navy itself, the Naval Command and the maritime zone commands, the Marine Corps and the naval and marine forces and units entitled to bear coats of arms, the marine battalions, the Naval School, the Naval Technologies, Maritime Authority and Marines schools and the Naval and Marine bases. Guidons are borne by independent Marine companies and divers units. Heraldic pennants are borne by small naval units not entitled to bear heraldic standards and by Marine companies that are part of battalions. Air Force's heraldry The heraldry of the Portuguese Air Force was officially regulated in 1985, being largely based on the Army's 1969 heraldic standards. The 1985 Regulation of Heraldry is an update of the transitional standards approved in 1978 and replaced the previous Air Force's flag regulation of 1960, which also defined the mainly non-heraldic shields used by each unit. The coat of arms of the Air Force itself is field azur with a spread eagle or beaked and membered gules, an aeronautical coronet and under the shield a scroll with the motto Ex mero motu (from the mere motion). The aeronautical or Air Force's coronet is a variation on an astral crown, in which the pairs of wings alternate with crosses of Christ (traditional emblem of Portuguese military aviation). The achievement of arms of the Air Force can also be represented in the form of greater arms, with the addition of the following external elements: crest (a wing or charged with a cross of Christ), torse (azur and or), supporters (a