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

November 21

USS ENDURANCE (MSO-435) cruises into position alongside the oiler USS MISPILLION (AO-105) for underway refueling, 5 January 1971. Catalog #: USN 1147566

1970  Two 378-foot cutters, CGC Sherman and Rush, combined with USS Endurance to attack and sink a North Vietnamese trawler attempting to smuggle arms into South Vietnam.

The Reliance-class medium endurance cutter USCGC Decisive (WMEC 629) conduct at sea engagements with the navy of Guatemala in the territorial seas of Guatemala on Oct. 25 – 26, 2021. The U.S. Coast Guard conducts routine deployments in the Southern Command area of responsibility, works alongside partners, builds maritime domain awareness, and shares best practices with partner nation navies and coast guards. (U.S. Coast Guard photo)

1995  CGC Decisive located and began tracking a 75-foot freighter packed with Haitian migrants 30 miles off the northwest coast of Haiti on November 19.  The cutter followed the freighter for two days as it maneuvered in and out of Cuban territorial seas, refusing to allow a boarding party aboard.  Finally, at noon, November 21, with  USCGC Northland having joined the chase, the captain of the freighter allowed a boarding team to come aboard where they discovered 516 migrants.   Using small boats from both cutters, the migrants were brought aboard Northland and were repatriated.

Coastal freighter Calypso

2014  Watchstanders at the Coast Guard 7th District command center received a report from a tug stating they heard a distress call from a vessel claiming to be taking on water off the coast of Great Inagua, Bahamas.  A Coast Guard MH-60 crew deployed in support of Operations Bahamas, Turks and Caicos (OPBAT) launched and located the coastal freighter Calypso approximately 50 miles off the coast of Great Inagua.  The helicopter crew lowered a rescue swimmer down with a dewatering pump.  Calypso began to slowly transit to the coast of Haiti to investigate the source of the flooding.  At approximately 12:30 p.m., CGC Charles Sexton arrived on scene and Coast Guard crewmembers were transferred to the freighter and assisted with the dewatering of the vessel.  The freighter began to list on the right side due to the amount of water in the lower compartments.  To ensure the safety of everyone aboard, all seven crewmembers were removed and transferred to the cutter Sexton with no medical concerns.  CGC Thetis arrived on scene at approximately 7 p.m. and safely transferred the seven crewmembers from Sexton to Thetis.  At approximately 7:30 p.m., crewmembers from the cutter Thetis reported seeing the freighter Calypso continue to list on the right side before sinking approximately 45 miles north of Cap Haitien, Haiti.