This is how you avoid enemy radar! RAF and USAF pilots overbank and invert jets as part of a joint low-level flying exercise over the Welsh mountains

RAF pilots were joined by the USAF for low flying training over the Welsh mountains on Monday. Their aircraft were seen flying over the Mach Loop, a set of valleys between Dolgellau and Machynllet, in north Wales, as part of the session between 10 and 11am. An RAF Hawk T2 from Hawks Valley, which is used to train pilots for fast low flying, was seen twirling over the hills at between 100ft and 250ft, at one point inverting over a ridge line - a technique often used to avoid enemy radar.

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