Operation Pacific Assist was an operation commenced by Australian Defence Force and New Zealand Defence Force[citation needed] together with Emergency Management Australia and Emergency Management New Zealand[citation needed] as an effort to support the relief activity on the aftermath of the 2011 Tōhoku earthquake and tsunami and Fukushima Daiichi nuclear disaster which occurred in Japan.

Royal Australian Air Force (RAAF) and Royal New Zealand Air Force (RNZAF)[citation needed] deployed C-17A Globemaster III aircraft onto the transportation support activity.

[1] The C-17A then remain in Japan to provide transportation help for Japanese and American government, includes for example, transporting vehicles and personnel of 15th Brigade of Japan Ground Self-Defence Force from Kadena Air Base in Okinawa to Yokota Air Base,[2] and transporting drinking water from Chitose Air Base to Hanamaki Airport.

[4] On March 22, 2011, in order to help with containing the Fukushima Daiichi nuclear disaster, two additional C-17A carrying water cannon system have been sent to Japan.

During the operation, 23 sorties were commenced, transporting more than a million pounds of cargo, including 41 vehicles and 135 personnel.