The ones who's stories were never told, because they were never there.
And we have a WINNAH!
I DO have a somewhat unusual nominee- a British Reserve unit that during 1943, made their way into neutral territory, and blew up a German merchant vessel that was radioing U boats with shipping traffic leaving the harbor.
In 1943, the Calcutta Light Horse in India was tasked with taking out the freighter Ehrenfels (sp?) which was interned in a neutral port (Portugal) in the Indian state of Goa.
The Calcutta Light Horse was more of a National Guard unit. Members were businessmen, etc. Raid was made using a harbor dredge, weapons that could not be traced to the British, etc. This was kept classified until about 1978.
On returning to his office the day after the raid, one of the raiders, an insurance agent, found everyone in the office upset. Seems a ship his company insured had been blown up in the harbor at Goa.