The primary function of carrier-borne airpower is the direct support of ground operations, for which the Harrier GR7/GR9 aircraft are eminently suited. In an operation where there is a significant air threat to maritime forces, air defence will be provided by either land-based or coalition aircraft in addition to the sea-based air defence capability. In the future, the Joint Strike Fighter will give the joint force the ability to contribute to the full spectrum of fast jet air operations from either a carrier or a land base.