If they canned the RAF and transferred all the equipment to the Army/RN how many personnel do you think would go with it? If individuals had wanted to 'dig in' they would have joined the Army and if they had wanted to 'give up' they would have joined the Navy.
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.... and before anyone else says it, if they had wanted to wear RAC patrolmans uniform, nylon trousers, clothes from George at Asda and white socks then they would have joined the Air Force. Which they did!