Operation Tomodachi (トモダチ作戦 Tomodachi Sakusen, literally "Operation Friend(s)") was a United States Armed Forces (especially U.S. Forces Japan) assistance operation to support Japan in disaster relief following the 2011 Tōhoku earthquake and tsunami. The operation took place from 12 March to 4 May 2011; involved 24,000 U.S. servicemembers, 189 aircraft, and 24 naval ships; and cost $90 million.

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