The black beret is a type of headgear. It is commonly worn by paramilitaries and militaries around the world, particularly armored forces such as the British Army's Royal Tank Regiment (RTR), the Royal Canadian Armoured Corps (RCAC), and Royal Australian Armoured Corps (RAAC) and the Indian Army Armoured Corps. Notable non-armored military units to wear the black beret include the non-military police and non-special forces elements of the Irish Defence Forces, MOD Guard Service, Russian Naval Infantry (and formerly Soviet) and Russian OMON units, the United States Air Force (USAF) Tactical Air Control Party (TACP), Philippine National Police-Special Action Force (PNP-SAF) members, and the Royal Canadian Navy ("navy blue"). It was also worn by the United Kingdom's Royal Observer Corps (ROC)