Based on the Coast Guard Historian’s timeline, https://www.history.uscg.mil/research/chronology/
With inspiration from Mike Kelso

June 23

View of Boston Light, 1729, Boston Public Library

1716  The Province of Massachusetts authorized the erection of the first lighthouse in America. “This bill named the location for the light as the southern part of Great Brewster Island, then called Beacon Island, and today known as Little Brewster Island.“

Boston Light at sunset
NPS Photo/G. Sager

1817  The cutter Active forced a South American privateer posing as an armed merchantman to leave the Chesapeake Bay and American waters.

USCGC Comanche former USRC Windom

1895  USRC Windom was launched.  She was the service’s first attempt at “modern” ship construction and was designed by the Coast Guard’s Engineering Division, complete with in-house staff naval architects and engineers.  Windom was the first cutter to have a modern powerplant, in this case a triple-expansion steam engine, and a fully watertight hull with transverse and longitudinal bulkheads.  She was capable of making a top speed of 15 knots.

USCGC Nike (WPC-112); late WWII outfit. no caption/number; photographer/date unknown.

1934  CGC Nike departed on a thousand-mile trip to the sea after it became the Coast Guard’s first patrol boat built on an inland waterway.  It was built at Point Pleasant, West Virginia and was launched into the Ohio River after being christened by Mrs. Charles O. Weisenberger, wife of the president of the Marietta Manufacturing Company which built Nike.  The cutter was bound for Pascagoula, Mississippi to replace the recently decommissioned cutter Tuscarora, which itself had been in service for over 35 years.

1939  Congress created the Coast Guard Reserve which later became what is today the Coast Guard Auxiliary.