the Atlantic. Canadian manufacturing methods and tooling used American, not British designs, so implementing the plan would have meant complete changes to Canadian factories. Once war began, however, British companies refused Canadians their designs and Britain was uninterested in Canadian military equipment production. (When Canada suggested in early 1940 that its factories could replace British equipment given to the 1st Canadian Division, Britain replied that Canada might provide regimental badges.) While Britain gave Canada priority over the United States for purchases, Canada had very little military production capacity in 1939 and Britain had a shortage of Canadian dollars. As late as 12 June 1940, King's government and the Canadian Manufacturers' Association asked the British and French governments to end their "small experimental orders" and "make known at the earliest moment their pressing needs of munitions and supplies", as "Canadian plants might be utilized to a far greater extent as a source of supply". This situation began to change on 24 May 1940, during the Battle for France, when Britain told Canada that it could no longer provide equipment. 48 hours later, Britain asked Canada for equipment. On 28 May seven Canadian destroyers sailed to the English Channel, leaving only two French submarines to defend the nation's Atlantic coast. Canada also sent 50 to 60 million rounds of small arms ammunition and 75,000 Ross rifles, leaving itself with a shortage. The air training plan's first graduates were intended to become instructors for future students, but they were sent to Europe immediately because of the danger to Britain. The end of British equipment deliveries threatened the training plan, and King had to ask president Franklin D. Roosevelt of the United States for aircraft and engines by stating that they would help defend North America. As the fall of France grew imminent Britain looked to Canada to provide additional troops to strategic locations in North America rapidly, the Atlantic and Caribbean. In addition to the Canadian destroyer already on station from 1939, Canada provided troops from May 1940 to assist in the defence of the West Indies with several companies serving throughout the war in Bermuda, Jamaica, the Bahamas and British Guiana. Canadian forces played a small role during the Battle of France, with the 1st Canadian Infantry Brigade being deployed to Brest as a part of the second British Expeditionary Force (BEF). The brigade advanced towards Le Mans on 14 June before