Why did Willie & Joe always need a shave?

One of the very first books I was given as a child was Up Front; the collection of Bill Mauldin's Willie & Joe WWII cartoons. I learned to color using those black and white pictures and over the decades have worn out at least three copies. It's a book I still pull out regularly to learn just a little more.

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Last week I was rummaging and came across some WWII Gillette Camouflage blades from the 4th quarter 1944...

Why did Willie & Joe always need a shave?

Why did Willie & Joe always need a shave?