51 Cancer Cases from US Ship that helped with Fukushima Nuclear Power Plant Rescue - Why?

Fifty-one crew members of the USS Ronald Reagan say they are suffering from a variety of cancers as a direct result of their involvement in Operation Tomodachi, a U.S. rescue mission in Fukushima after the nuclear disaster in March 2011. The affected sailors are suing Tokyo Electric Power Company (TEPCO), alleging that the utility mishandled the crisis and did not adequately warn the crew of the risk of participating in the earthquake relief efforts.

http://www.dailykos.com/story/2013/12/18/1263608/--51-US-Navy-Sailors-Sickened-3-Years-After-Participating-in-Fukushima-Rescue-Effort