The biggest stimulus for men to continue shaving is to make sure that gas masks seal properly. In the RN beards are still quite common- but at some point in the runup to war shaving would be compulsory.
For example: on the way south to the Falklands in '82, the point at which the reality of war sank in for many was when the salty old triple-badgers appeared clean-shaven for the first time since their teens...
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