The outbreak of World War I found the British Army's Royal Flying Corps with just over 200 fragile, unarmed reconnaissance aircraft, and a uniformed strength of just over 2,000 all ranks; the Royal Naval Air Service had some 50 seaplanes. By the Armistice of 1918 the unified Royal Air Force was the largest in the world, with about 22,650 aeroplanes and 27,330 men operating from some 700 bases. This first in a two-part study describes and illustrates, in unprecedented detail, the uniforms of the RFC and RNAS in 1914-18-20. A detailed and interesting study.