"Wherever they go - they'll want to write as well as fight!" Possibly the former more than the latter.
If you've never seen V-Mail, well, it was tiny. Letters were photographed ("in strictest privacy") and shrunk down to conserve space.
Mind you, it wasn't V-Mail. It was V..._ Mail, in keeping with the use of the opening notes of Beethoven's Fifth as the motto of victory and freedom.