The NATO standardization agreement that covers APP-6A is STANAG 2019 (edition 4), promulgated in December 2000. With the formation of NATO in 1949, the US Army system was standardized and adapted, with different shapes for friendly (blue rectangle), hostile (red diamond) and unknown (yellow quatrefoil) forces. The infantry symbol of a saltire in a rectangle was said to symbolise the crossed belts of an infantryman, while the single diagonal line for cavalry was said to represent the sabre belt. However, the system now in use is broadly based on that devised by the US Army Corps of Engineers in 1917. During World War I, there was a degree of harmonisation between the British and French systems, including the adoption of the colour red for enemy forces and blue for allies the British had previously used red for friendly troops because of the traditional red coats of British soldiers. The first basic military map symbols began to be used by western armies in the decades following the end of the Napoleonic Wars. 11.1.2 Mobility and auxiliary equipment.11.1.1 Feints/dummies and installations.
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