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A marine atmosphere exposure study was implemented and completed. Its objective was the acquisition of data and the evaluation of performances of various protective systems applied to couples of magnesium with aluminum, cadmium, copper, steel, stainless steel, and zinc, to serve as a guide to designers and developers of military equipment. Protective systems for the magnesium included chromate conversion and anodic coatings, and paint systems consisting of chromate primer and alkyd, phenolic, and epoxy enamels. Inorganic and organic protective systems for the cathode metals included the types employed with magnesium, except that the pretreatments for steel were phosphate types and pretreatments for copper and stainless steel were limited to cleaning only. Contact and insulated couples were represented. Appropriate controls were included; these were: uncoupled bare metals; coupled bare assemblies; coupled, pretreated, unpainted assemblies; and several assemblies with paint systems applied to unpretreated, coupled metals. Specimens were exposed at the Olympic site, approximately one mile south of San Francisco, Calif. The results reported herein cover an exposure period of 14 months.