I have family that have worked in the MOD (science & aviation) and then (national intel) all there working life and I think you will find it was not "our" choice to become involved with Iraq or the Afgan affair. It was more on the lines of the US asking for our help.
The US have never been invaded (other than the 911 issue) and they have NEVER won any conflict they have been involved in. Whereby we have very rarely lost a war hence owning half the planet at one stage.