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San Diego-based Science Applications International Corp. said it has completed its agreement with Lockheed Martin Corp. to be the successor contractor of an existing $250-million National Aeronautics and Space Administration contract. . . . San Diego-based Safeskin Corp. said founder and co-Chairman Neil Braverman has resigned. . . . Los Gatos-based Metricom Inc., at the behest of investor Lindner Investments, said it will ask shareholders at its May 1 meeting for a nonbinding vote on whether the company should be sold. . . . Long Beach-based BW/IP Inc., the parent company of BW/IP International Inc., said it has acquired Anchor/Darling Valve Co., the U.S. valve subsidiary of Radnor, Pa.-based Superior Group Inc., under undisclosed terms. . . . Petco Animal Supplies Inc. completed the acquisition of Pet Food Warehouse Inc. for about $42 million in stock.