Special forces
The U.S. invasion of Afghanistan involved special forces from several coalition nations, who played a major role in removing the Taliban from power in 2001–2002. Special forces have continued to play a role in combating the Taliban in subsequent operations.
As gender restrictions are being removed in parts of the world, females are applying for special forces units selections and in 2014 the Norwegian Special Operation Forces established an all female unit Jegertroppen (English: Hunter Troop).

Tier One units: These are the highest level of military special forces, as in the highest trained and usually the most secretive. Examples would be the special mission units of the Australian and United States special operations forces.

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Notes: 

References: 
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Haskew, Michael E (2007). Encyclopaedia of Elite Forces in the Second World War. Barnsley: Pen and Sword. ISBN 978-1-84415-577-4.
Horner, David (1989). SAS: Phantoms of the Jungle: A History of the Australian Special Air Service (1st ed.). St Leonards: Allen & Unwin. ISBN 1-86373-007-9.
Molinari, Andrea (2007). Desert Raiders: Axis and Allied Special Forces 1940–43. Osprey Publishing. ISBN 978-1-84603-006-2.
Otway, Lieutenant-Colonel T.B.H. (1990). The Second World War 1939–1945 Army – Airborne Forces. Imperial War Museum. ISBN 0-901627-57-7.
Thomas, David (October 1983). "The Importance of Commando Operations in Modern Warfare 1939–82". Journal of Contemporary History. 18 (4): 689–717. JSTOR 260308.