The RAF have offered up the new Nimrod MRA4 and the Tornado GR4 fleets as a sacrifice to save billions of pounds over the long run. The cuts were offered by the RAF as part of the government's strategic defence review and would hit Scotland hard with the closure of a base and the scrapping of an expansion of another. It is thought the RAF are playing the game though as one of the Nimrods' major roles is to protect the Navy's Trident submarines and it is likely the Navy would oppose such a cut. The Tornado cut, which would be within 5 years, is more likely however as the planes would be nearing the ends of their lives by then anyway. Although their official withdrawal date is 2025 it is thought they will be out of hours some time before that.