No job security but they will either move into the so called civilianised post at a very nice salary PLUS their excellent pension. Or... they will get a directorship on the board of the many defence Contractors that are selling equipment to the MoD at exorbitant prices, my heart bleeds for them.
I also need someone to explain how we still need all these flag officers now that we are perhaps a 'Third World Military Force' that is being asked to fight wars with a blunt dagger in lieu of a razor sharp rapier
