One-time experiments in "express" delivery of this have included firing a guided missile from a sub in 1959
[DOC] [TLE] Jeopary Questions page 1334 - MULTIPLE MEANINGS - TriviaBistro ... [PAR] BEFORE COMPUTERS: One-time experiments in "express" delivery of this have 
included firing a guided missile from a sub in 1959  WE LOVE BROADWAY... [DOC] [TLE] Regulus Missile Mail - Postal Museum - Smithsonian [PAR] First Official Missile Mail- Envelope from the Regulus I experimental flight to The 
Honorable ... On June 8, 1959, the US Navy fired a Regulus I missile from the 
USS ... containers, holding 3,000 letters, inside the sub's missile prior to the flight.