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

January 29

1919 Ratification of the 18th Amendment to the U.S. Constitution occurred on this date.  The amendment prohibited the manufacture, sale, and transportation of alcoholic beverages.  Its enforcement was authorized by the National Prohibition Enforcement Act, otherwise known as the Volstead Act that was passed on October 28, 1919.  The Coast Guard was tasked with the prevention of the maritime importation of illegal alcohol.  This led to the largest increase in the size and responsibilities of the service to date.

USCGC Bibb

1938 CGC Bibb reported for duty in connection with the U.S. Navy exercises held off Culebra, Puerto Rico.

The U.S.S. Serpens Monument is dedicated to those who lost their lives when the U.S.S. Serpens was destroyed. The 14,250-ton ammunition ship exploded off Lunga Baech, Guadacanal, British Solomon Islands on the night of Jan. 29, 1945 and was the largest single disaster suffered by the U.S. Coast Guard in World War II. (U.S. Army photo by Rachel Larue/released)

1945 The Coast Guard-manned attack cargo vessel USS Serpens exploded off Guadalcanal due to unknown causes.  Only two men aboard survived.  This was the single greatest Coast Guard loss of life in history.

USCGC CASCO 1961

1963 CGC Casco inaugurated the expanded Ocean Station Vessel Oceanographic Program when it departed for Ocean Station Echo on this date.  Casco was outfitted for oceanographic research by the addition of a laboratory space, hydrographic winch, and other instruments.  As the first Coast Guard Ocean Station Vessel to be so outfitted, Casco’s mission represented “a significant step on the Coast Guard’s participation in the National Oceanographic effort.”

USCG HH-3F Pelican on the water, demonstrating its amphibious capability. This was also the first HH-3F delivered to the Coast Guard.

1980 Local authorities in the Tijuana, Mexico area requested Coast Guard assistance in evacuating flood victims stranded by the rising waters of the San Miguel River.  Two HH-3F helicopters from Air Station San Diego transported 180 persons to safety during the two-day operation.