and their use became more widespread in the British Army during and after the Second World War to replace side caps for wear with combat uniforms when protective headgear was not being worn. Originally, khaki was the standard colour for all units, but specialist units adopted coloured berets to distinguish themselves. For example, airborne forces adopted a maroon. This has since been adopted by many other parachute units around the world. The Commandos adopted a green beret. The Special Air Service (SAS) initially adopted a white beret quickly changing this to a beige or sand coloured one. From 1944 they wore the Maroon airborne forces beret but the beige beret was re-adopted following the re-formation of the Regular SAS in Malaya. Dark blue berets are worn by those units not authorised to use a distinctively coloured beret or other headdress. A peaked cap, with a coloured hat band, is intended to be worn with the No 1 Dress uniform, berets are the most common form of headdress seen with other orders of dress and are worn in No1 and 2 dress by some Regiments and Corps. The blue or green No 1 Dress was not universally adopted after its initial introduction in 1947, khaki No 2 dress being the most usual order of dress for parades and formal occasions. The reason was mainly one of economy, although it was sometimes criticised as being too similar to police and other civilian uniforms. As noted above, the practice of issuing other ranks in line regiments with full sets of both service dress and dress uniforms effectively ended in 1914 and was never completely returned to. Today full dress or No 1 Dress uniforms are only held in limited quantities as common stock, and issued only to detachments for special ceremonial occasions. Practices do however vary between units and historic items of uniform are more likely to appear where tradition is particularly strong. As an example, the Royal Military Academy Sandhurst wore scarlet and blue "review order" uniforms until World War I, substituted khaki service dress for parade from 1919 to 1939 and now holds dark blue No 1 dress uniforms for the use of its cadets. Until 1995 the Royal Military Police retained "blues" for their now disbanded Mounted Troop. Royal Air Force Historically, the Royal Air Force regulations permitted the wearing of a full dress uniform in both home and warm-weather