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

June 5

1794  The Third Congress authorized an additional 10 revenue cutters and gave the Treasury Department the responsibility for lighthouses, beacons, buoys, and piers.

1912  Senator Charles E. Townsend of Michigan introduced a bill to consolidate Life-Saving Service and Revenue Cutter Service to form the Coast Guard.  The bill became law on January 28, 1915.

Thomasania Montgomery

1975  ENS Thomasania Montgomery and ENS Linda Rodriguez graduated from Coast Guard Officer Candidate School, Yorktown, VA, thereby becoming the first African-American female commissioned officers in the Coast Guard.