In order to meet a perceived 'continental threat', the British military developed the idea to site a Royal Air Force bomber base at Mildenhall in the late 1920s. Shortly thereafter, the government purchased the land in 1929, followed by the completion of the first buildings in 1931. Three years later, RAF Mildenhall opened on 16 October 1934,[4] as one of the RAF's largest bomber stations. On the same day, Wing Commander Francis Linnell, assumed his position as the first station commander.[5]

RAF Mildenhall's premature inauguration was due in large part with its selection to host the Royal Aero Club's prestigious MacRobertson Air Race on 20 October 1934. At the time, the air race stood as the longest race ever devised, and attracted over 70,000 spectators to the airfield. Even more telling of the race's significance in the world's sporting spotlight, on short notice King George V and Queen Mary visited RAF Mildenhall the day before the race. In the end, pilots Tom Campbell Black and C. W. A. Scott flying the de Havilland Comet Grosvenor House, crossed the finish line first at Melbourne, Australia, less than 72 hours after starting the race.[6]

Following this favourable beginning, RAF Mildenhall received its first squadron and aircraft with the arrival of No. 99B Squadron, equipped with Handley Page Heyford bombers. King George V reviewed 350 aircraft at Mildenhall in 1935 on the occasion of his Silver Jubilee. This historical event is commemorated by a memorial tablet located in front of the Building 562, the current 100th Air Refueling Wing headquarters.[7]

The threat the RAF had envisioned in the late 1920s materialised during the Munich Crisis. Between 26 September 1938 and 4 October 1939, the airfield completed its installation of its defence systems. After a brief reprieve from war, the airfield prepared for war, bringing station defences and squadrons to full combat readiness. On 3 September 1939, three days after Germany invaded Poland, Britain and France declared war on Germany. Later that same day, three Vickers Wellington aircraft from No. 149 Squadron at Mildenhall were dispatched to bomb the German naval fleet at Wilhelmshaven.[