“Popski’s Private Army” or Correctly No.1 Demolition Squadron PPA: http://www.popski.org/
Possibly the smallest unit of the British Army, was founded in Cairo in 1942 by Lieutenant Colonel (then Major) Vladimir Peniakoff DSO MC. Popski’s Private Army was one of several raiding units formed in the Western Desert during the Second World War. They also served in Italy before they were disbanded in September 1945.
A hugely interesting set of citations for bravery medals: http://www.popski.org/reference/ppa/citations