Upon graduating from the U.S. Coast Guard Academy in 1954, RADM Danielson's first assignment was for two years aboard the USCGC Coos Bay, homeported in Portland, Maine. Following a month at the Coast Guard LORAN Indoctrination School, he was assigned as a Rescue Coordination Center watchstander in the Seventh Coast Guard District, Miami, Florida.
In August 1957, RADM Danielsen reported to Coast Guard LORAN Station San Salvador as Commanding Officer. His next assignment was at Coast Guard Base St. George on Staten Island, New York.
In 1960, he attended the U.S. Navy Postgraduate School in Monterey, California majoring in Management. RADM Danielsen then had back-to-back Executive Officer assignments aboard the Coast Guard Cutters Blackhaw and Basswood in Honolulu. His next tour was as Assistant Chief, Aids to Navigation Branch in the Fourteenth Coast Guard District, Honolulu, Hawaii.
From 1965-69, RADM Danielsen served as Chief, Supply Branch and then District Comptroller in the Fifth Coast Guard District, Portsmouth, Virginia.
In June of 1969, he returned to the Coast Guard Academy as Assistant Commandant of Cadets; a post he held for four years. He was then assigned as Chief, Plans and Evaluation Division at Coast Guard Headquarters, Washington, D.c., Office of Chief of Staff.
In July 1976, RADM Danielsen became Dsitrict Comptroller, Third Coast Guard District, Governors Island, New York, and from 1979-80 he commanded the Coast Guard Supply Center, Brookly, New York.
From 1980-83, RADM Danielsen, was Assistant Superintendent, Coast Guard Academy, New London. He was reassigned to Governors Island, New York were he served as Deputy Commander, Atlantic Area.
In June 1984, RADM Danielsen became the Commander, Ninth Coast Guard Distrct, whose responsibilities cover all of the Great Lakes.
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