"My Darling Wife,"
"V, or Victory mail, was a valuable tool for the military during World War II. The process, which originated in England, was the microfilming of specially designed letter sheets. Instead of using valuable cargo space to ship whole letters overseas, microfilmed copies were sent in their stead and then "blown up" at an overseas destination before being delivered to military personnel."
~National Postal Museum
V-mail was used so that the Office of War Information could censor any information about the war that the soldiers or American citizens tried to send over seas. The government looked over every piece of v-mail that was sent. V-mail also helped make room in aircraft for more military supplies. "The 37 mail bags required to carry 150,000 one-page letters could be replaced by a single mail sack. The weight of that same amount of mail was reduced dramatically from 2,575 pounds to a mere 45."