The Mk 6 helmet is a type of combat helmet that was the standard of the British Armed Forces as well as another supplied helmet of the UN during peacekeeping operations. The Mk 6 replaced the Mk IV helmet (more correctly titled – Helmet Steel MK IV, General Service) in army service and the RAC helmet in naval service. The jump in MK numbers is thought due to the confusion surrounding the MK IV helmet using the MK V lining, introduced in 1959.^[1]

The helmet is manufactured by NP Aerospace,^[2] and is reported to have an "almost unlimited service life" by the manufacturer.^{[citation needed]}

The Mk 6 was issued to the British military in 1986.^[3] They were known to be used in Operation Desert Storm and Desert Shield.^[4]

From 1992, the Mk 6 was supplied to the UN alongside the M88, MICH and the M1 to allow for protection of peacekeeping forces. Many military forces used these helmets such as Argentina, Mexico, and most listed UN countries as stated. These were either covered with the respective country's camouflage helmet cover, or issued with a blue Mk 6 cover to indicate it as a peacekeeping helmet.^[5]

From June 2009, the helmet was replaced by the Mk 7 helmet.^[6]

The Mk 6, in its default configuration, is in dark green color. The British Army use covers to camouflage the helmet and adapt it to different environments. Covers include the British Disruptive Pattern Material in temperate woodland and desert patterns,^[7] multicam pattern, Disruptive Pattern Combat Uniform, a pure white cover for arctic environments and a United Nations blue coloured cover. The MK 6 is designed to accept modern ear protection, Bowman personal radios, and respirators.

It is sometimes referred as the "battle bowler", a term first used for the First World War Brodie helmet.

The Mk 6 is often mistakenly thought to be made out of kevlar when in fact it is constructed of ballistic nylon.^[8]

• Mk 7 helmet - Mk 6 replacement, general issue commenced in June 2009