V MAIL,ww 2 airmail, COVERS

 An unprecedented amount of mail was moved about during the war with Army post offices, fleet post offices and US post offices flooded with mail. Each year of the war, the number of pieces of mail increased. In 1945, 2.5 billion pieces went through the Army Postal Service and 8 million pieces through Navy post offices.

V-mail. V-mail, short for Victory Mail, was a hybrid mail process used by the United States during the Second World War as the primary and secure method to correspond with soldiers stationed abroad.