Five examples were operated by the US Coast Guard during the 1930s, named Antares, Altair, Acrux, Acamar, and Arcturus (hull numbers FLB-51 through FLB-55).
Lima contoh yang dioperasikan oleh US Coast Guard selama tahun 1930, bernama Antares, Altair, Acrux, Acamar, dan Arcturus (nomor lambung FLB-51 melalui FLB-55).