On 23 June 1923, four lieutenants, Virgil Hine, Frank Seifert, Lowell H. Smith and John P. Richter at US Army Air Service Station Rockwell Field, San Diego conducted the world's first refueling. Using a surplus WWI bomber, the DeHaviland DH.4B, as a testbed, the crew passed 75 gallons of gasoline via gravity hose extending the range of their receiver to 6 hours 38 minutes.
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