The first RAF Cloud flew in July 1931 following an Air Ministry order for a single machine that was the third Cloud built. Its specification was initially very similar to the civilian one, other than an increased fuel capacity, the ability to fit two 500-lb bomb racks and gun rings fore and aft. Trials with this machine led to several modifications including enlarged elevators, revised horn balances, Townend rings, stiffer engine mounts, strengthened empennage, and reinforcement of the hull bottom and floats. The Air Ministry placed an order in 1932 for sixteen machines using this revised military specification, and designated A.29 Clouds. The RAF used the machines for pilot and navigator training. Service introduction was 1933 and retirement occurred in 1939.

The Cloud handled well both in the air and on the water despite a rather ungainly appearance. It was an important type for Saro regardless of its small production number and comparatively short RAF service. It helped establish both a financial platform and reputation as a specialist flying-boat manufacturer.

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