"The British government has made clear it will not publicly participate in any training operation inside Libya, believing any ground-level intervention must be seen to done by Arab states. However, it is believed that former British personnel could be used as trainers and “force multipliers”. Former members of the Special Air Service, Special Boat Serve and other elite British regiments are frequently employed by private military companies and Middle Eastern regimes as “advisers” for their own armed forces. For operations where the British Government is not officially involved, Special Forces personnel are often allowed to temporarily resign or take leave in order to fight for others. In the 1970s, former members of the SAS fought for the Sultan of Oman with Britain’s tacit support. Many of the SAS soldiers were allowed to temporarily resign from the British Army for the Oman campaign, then returned to service afterwards." (thanks Nu`man)