On June 8, 1959 a Navy submarine fired a guided missile carrying 3,000 letters to debut missile mail

Throughout its history, the Postal Service has explored faster, more efficient forms of mail transportation. Technologies now commonplace – railroads, automobiles, and airplanes – were embraced by the Post Office Department at their radical birth, when they were considered new-fangled, unworkable contraptions by many. One such technology, however, remains only a footnote in the history of mail delivery – missile mail.