Nuclear claims between the U.S. and the Marshall Islands are ongoing, and health effects from these nuclear tests linger. Project 4.1 was a medical study conducted by the United States of those residents of the Bikini Atoll exposed to radioactive fallout. From 1956 to August 1998, at least $759 million was paid to the Marshallese Islanders in compensation for their exposure to U.S. nuclear weapon testing.