"Marine Corp Exp, Forces Nicaragua Apr. 16, 1928" duplex cancel ties 10c Lindbergh Airmail (Scott C10) on airmail cover to Boston via New York City, "Boston, Mass. G.P.O. Airmail May 2, 1928" circular backstamp, neatly opened at top

According to wikipedia, the US occupation of Nicaragua from 1912 to 1933 was part of the Banana Wars and was designed to stop any other nation from building a canal across Nicaragua. 

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