WW2 SLANG

TIN HAT
Steel helmet. A popular phrase of the time was: "It just about put the tin hat on it", meaning that something happened which spoiled everything or was the final straw.
 
TIN OPENER
A bayonet.
 
TOASTING FORK
A bayonet, often used for this purpose.
 
TOC EMMA
Trench mortar (TM). From the phonetic alphabet.
 
TOFFEE APPLE
Mortar bomb with attached shaft.