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

March 12

1955  Effective this date, all foreign and domestic ships were required to give 24-hour advance notice to the local U.S. Coast Guard Captain of the Port before entering U.S. ports.  This order was designed to improve the U.S. Coast Guard’s port security program without “material inconvenience” to shipping.

The 82-foot patrol boats of Squadron One (RONONE) deploying from Subic Bay in the Philippines to the theater of operations in Vietnam. (U.S. Coast Guard)

1965  This date marked the beginning of the U.S. Navy’s Operation Market Time.  The operation was designed to interdict the river and coastal water supply lines of Communist forces in South Vietnam.  The initiation of this campaign led to the Navy’s request for Coast Guard vessels and crews to participate in river and coastal patrols during the Vietnam War.

The first three fast response cutters—the USCGC Richard Etheridge (WPC-1102), Bernard C. Webber (WPC-1101), and William Flores (WPC-1103).
U.S. COAST GUARD

2012  Coast Guard Commandant Admiral Robert Papp participated in a ceremony at Bollinger Shipyards in Lockport, Louisiana, to dedicate the new Fast Response Cutter fleet.