Andrew Brookes, a former RAF pilot and director of the Air League, which promotes the cause of British aviation, warned the plan was short-sighted.
He told BBC News: "If you cut back the premier league capability of the UK forces in order to just win a counter insurgency campaign against the Taliban, which has no air force and has no tanks and has no warships, when you finally do pitch up against a state that has those capabilities you could seriously end up losing a conflict that really matters to the UK in future in order to win one in Afghanistan today."