Coast Guard Call Signs
Most Coast Guard land-based VHF radio stations do not use three-letter call signs as the larger communications stations do; instead, they identify themselves by the activity name, such as "Sector Baltimore", "Station Washington, D.C. (or Station Washington)". Boats identify themselves with the last digits of their registration number, for example, a Defender-class boat with the registration 25123 would be "Coast Guard 25123, while a 41-foot boat would be "Coast Guard 41345." Cutters identify themselves as "Cutter (name)". Aircraft identify themselves by their number. A number beginning with "15,17,20" is a HC-130; "21" is a HU-25A/C/D; "23" is a HC-144A; "60" is a MH/HH-60J/T helicopter; "65 or 66" is a HH/MH-65; . Auxiliary aircraft and ships identify themselves as "Auxiliary ###".
Read more about this topic: U.S. Coast Guard Radio Stations
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—Robinson Jeffers (1887–1962)
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—Umberto Eco (b. 1932)