See Operation Mincemeat for Major Martin's role in WW2. The body was identified in 1996 as that of Glyndwr Michael, a Welsh homeless man, but the Wikipedia page puts forward a number of other possibilities.
Wikipedia has this grim photo captioned "Corpse of 'William Martin', prepared for release into the water".
This section lists the memorials where the subject on this page is commemorated:
Major William Martin
The Biblical quotation draws attention to the secrecy which was essential to ...
Resident of the Central Ward, Hendon who served and died in WW1.
Hamilton Jefferson was born on 19 August 1897 in Groton, Massachusetts, USA, the fourth of the six children of George David Jefferson (1863-1937) and Rebecca Gorham Jefferson née Kettle (1864-1918)...
American army surgeon prominent in proving that yellow fever is transmitted by mosquitoes. Born Belroi, Virginia. Died Washington.
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