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

April 18

USRC Louisiana

1805  The cutter Louisiana recaptured the merchant brig Felicity from privateers off the mouth of the Mississippi River.

1945  Airship training for U.S. Coast Guard personnel (nine officers & 30 enlisted men) began at Naval Air Station Lakehurst, New Jersey.

1993  Coast Guardsman Gary A. Openshaw rescued five persons in danger of drowning near San Francisco off Baker Beach.  For heroically risking his life and saving those five people, the Coast Guard awarded Petty Officer Openshaw the Gold Life-Saving Medal.