U.S. responds to Japan's nuclear crisis

More U.S. military crews were exposed to radiation Tuesday as the Pentagon ramped up relief flights over a Japan reeling from an earthquake, tsunami and nuclear crisis. The Defense Department said the Navy started giving anti-radiation pills to some of those exposed, and Americans on two military bases south of Tokyo were advised to stay indoors as much as possible. With more aid for victims on the way, the U.S. Navy said it was redirecting three ships to work in the Sea of Japan on the country's west coast rather than risk the hazards of radiation and the debris field in the waters off the east coast.