Encyclopedia - Jack Johnson
A 'Jack Johnson' was the British nickname used to describe the impact of a heavy, black German 15-cm artillery shell.
Jack Johnson (1878-1946) was the name of the popular U.S. (born in Texas) world heavyweight boxing champion who held the title from 1908-15.
A 'Base Rat' was a soldier perpetually at the base, typically in conditions of comfort and safety.
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