This study provides an overview of the International Air Force (IAF) concept, which emerged in the early 20th century out of a long progression of schemes for creating multi-national armed forces to enforce the peace, most often referred to as an international police force (IPF). After broadly tracing the IAF's complex lineage, Beaumont surveys the proliferation of IPF and IAF proposals throughout the 20th century, including schemes offered by Kipling, H.G. Wells, and Theodore Roosevelt. Later ideas included the Allies' Independent Air Force of 1917-18, the evolution of the League to...