A White House spokesman said Friday U.S. inspectors at the Soviet Union's primary nuclear test site were not spying but made a mistake when they "engaged in some unauthorized souvenir collecting," which has prompted a Soviet protest. Spokesman Marlin Fitzwater confirmed three members of the inspection team, all geologists, did pick up some rock samples, barbed wire, an Allen wrench and a hammer. The Soviets discovered the materials in equipment crates being shipped out July 17. Fitzwater said the three inspectors - one a government employee and two of them contractors - have been removed from the joint monitoring project. Sig Cohen, spokesman for the U.S. Arms Control and Disarmament Agency, said, "None of this material has any military significance." He said he did not know why the inspectors would have tried to take the material.