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 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 ...
Co-partner or employee of the South Suburban Gas Company. Served but did not die in WW1.
Awarded the VC for his heroism on 19 December 1914, age 26, while serving in the Corps of Royal Engineers. "Leaving his Sappers to finish their task he went to the aid of a West Yorkshire bombing s...
Male worshippers of St Paul's Church, Covent Garden who were killed serving in WW1.
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