as a patrol aircraft and a trainer until 1928.

Following the Armistice, eleven HSs passed into US Coast Guard service, remaining in service until 1926. As many as 83 HS boats were used by the United States Army Air Service for communications and survey purposes from overseas bases, although they were not given US Army serial numbers.

Surplus HSs were also widely exported. Amongst Military users was Brazil, who received six aircraft in 1918. Two HS-2Ls were used in an attempt

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