After the United States' entry into World War I in April 1917, General John J. "Blackjack" Pershing invited the British Royal Flying Corps to establish training fields in Texas for the training of American and Canadians volunteers because of its mild weather. After looking at sites in Dallas, Fort Worth, Waco, Austin, Wichita Falls and Midland, three sites were established in 1917 in the Fort Worth vicinity (known as the "Flying Triangle."), those being Hicks Field (#1), Barron Field (#2), and Benbrook Field (#3).