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

July 6

1809  Congress authorized the construction of twelve new cutters to enforce President Thomas Jefferson’s embargo.

Hall PH-2, V166

1942  Coast Guard Hall PH-2 amphibious aircraft V-166 landed in the open ocean and took aboard 21 survivors of a torpedoed tanker in Gulf of Mexico.