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The code name used by U.S. Navy Chief Petty Officer David Adcox. In 2001, the newly reinstated G.I. Joe team's new recruits included eager young Adcox. He stood out among the young "greenshirts" and became one of the leaders of the young recruits. After the Joe's battle against Serpentor's forces on Cobra Island, Adcox became a full-fledged member of the Joe team as an amphibious warfare specialist under the code name "Mariner". On his first mission as Mariner, he took part in a fight off the coast of Cobra Island that served as a distraction to allow Barrel Roll to infiltrate Cobra's headquarters. (v2 #2, 7, 28)