Thats because the police have a Federation. Talking of Dannatt on Newsnight last night seemingly brushing over the issue, he was the first CGS to attempt to seriously counter the idea of a military Federation. I have never been 'for' the idea, but that has always been based on the implicit understanding that the faith you place in those who look after your interests, is well founded. Dannatt of course, was Cameron's unofficial military adviser in the run up to the election.