The British and French military have been working together for almost a hundred years. Now a joint exercise is taking place aimed at fostering greater cooperation between their Air Forces.
The Combined Joint Anglo-French Expeditionary Force is based at RAF Leeming in North Yorkshire.
By training and preparing together, the aim is to ensure the forces are ready for joint operations, anywhere in the world.
As well as high-level training and preparation, that can also mean simple issues, like getting round the language barrier.
The heads of the two Air Forces paid a visit to RAF Leeming today. (14 October) Chief of the Air Staff Air Chief Marshal Sir Andrew Pulford was joined by his French counterpart General Denis Mercier.
Watch a full report from Helen Ford: