U.S. Military Ordered to Steer Clear of Japan Plant

U.S. forces in Japan are not allowed within 50 miles (80 km) of Japan's crippled nuclear power plant, the Pentagon on Wednesday, explaining measures meant to keep U.S. troops safe during a relief operation.

The U.S. military is also giving some flight crews potassium iodide tablets ahead of missions as a way to guard against effects of radiation, officials said.

The measures were seen as precautions and the Pentagon said no U.S. forces have shown signs of radiation poisoning.