also: ともだちさくせん
noun
Operation Tomodachi
Proper noun: the U.S. military's disaster relief operation after the 2011 Tōhoku earthquake and tsunami.
トモダチ作戦は、東日本大震災の際にアメリカ軍が行った支援活動の名称です。
Operation Tomodachi is the name of the relief activities conducted by the U.S. military during the Great East Japan Earthquake.
From English 'Operation Tomodachi', using the Japanese word 友達 (tomodachi, 'friend').