Anti-Aircraft Materiel, 1918-1930

On antiaircraft drills at Fort Story, Va. Reel 1, antiaircraft units set up and test sound locators and searchlights. 105-mm guns and 3- and 4-inch antiaircraft guns are loaded and fired on glider targets. Reel 2, machine guns and 3-inch antiaircraft guns are loaded, aimed, and fired. Sound locators and searchlights work in unison at night.