On 14 March 2011, the ship was forced to relocate to avoid a radioactive plume from the Fukushima I nuclear accidents which had contaminated 17 crew members of three helicopter crews. On 23 March, "Ronald Reagan"s crew performed radiation decontamination by scrubbing down any surface that could have been contaminated, including the island superstructure and flight deck, to remove any potential radiation hazards. On 4 April 2011, Japan's minister of defense, Toshimi Kitazawa, accompanied by US ambassador to Japan John Roos, visited the ship to thank the crew for their assistance as part of Operation Tomodachi. Said Kitazawa, "I have never been more encouraged by and proud of the fact that the United States is our ally." The ship returned to San Diego on 8 September 2011. In January 2011, the Navy announced that the aircraft carrier would be transferred to the Puget Sound Naval Ship Yard in Bremerton, Washington, for scheduled repair and maintenance beginning January 2012.