Almost from the beginning of carrier aviation, various aircraft were used to fly personnel and high-priority parts to carriers at sea. Probably the first systematic effort at what became known as carrier on-board delivery (COD) was initiated when the U.S. Navy deployed nuclear strike aircraft at sea in the early 1950s.
Beginning in 1951, nuclear-strike aircraft were forward based ashore in the Mediterranean area and atomic bomb components were placed on board forward-deployed aircraft carriers. But the nuclear inserts for the atomic bombs were not stored on carriers until at least 1953. In the interim, under a program code-named Daisy Chain, an elaborate scheme was developed to fly the plutonium cores from East Coast storage sites to Port Lyautey, Morocco, where modified General Motors-built TBM-3R Avenger aircraft would be waiting to fly the components out to the carrier.1