NEED FOR BIGGER ALLIED FORCE IN GULF PLAYED DOWN Secretary of State George Shultz said today that a boost in allied forces in the Mideast Gulf was not vital to protect shipping against attack but that possible allied contributions should be examined. Asked if he saw the need for a greater military presence by the allies in the gulf, Shultz told reporters, "Not necessarily, particularly, so." But he said an adequate force was needed to deter attack and noted that the British and the French, as well as the United States, maintained naval contingents there. "We have to look at things that others might do," he said.