Frame Measures: 20” x 26.25” - This poster marks a critical turning point in military aviation history. It represents the sudden shift of airplanes from experimental novelties to vital weapons of modern warfare. “Join the Air Service and Serve in France... Do it Now" poster is an iconic 1917 World War I recruitment piece by artist J. Paul Verrees. It features a biplane soaring overhead while two soldiers scan the horizon from the ground. Originals reside in institutions like the National Air and Space Museum and the Library of Congress.