Incredible footage shows US fighter jets soaring majestically over the Welsh valleys as they train with F-15 pilots on anti-terror exercises. The F-22 Raptors are seen zooming around the Mach Loop, a set of picturesque Valleys in Wales used by the RAF for low level training exercises. Aircrew from the USAF 95th Fighter Squadron set off from RAF Lakenheath in Suffolk before putting on the display as they begin a short tactical training secondment in Britain. The F-22 is a single-seat stealth aircraft renowned for its superior air-combat capabilities and during the clip viewers are allowed a brief insight into its agility and grace. The Mach Loop is a vital training ground for the RAF as it allows aircrews to practice the art of low flying, a tactic helping pilots to avoid enemy detection during a combat situation. Pilots from the 95th, affectionately nicknamed 'the Boneheads', were brought to Britain to train against and alongside different pilots and aircraft - rather than their usual US colleagues.