 Complete the following phrase:  In addition to their military tasks, the C-17s have formed part of the Australian Governments response to natural disasters. In November 2007 a C-17 delivered 27 tonnes of supplies to Port Moresby in Papua New Guinea following heavy flooding caused by Cyclone Guba. At the conclusion of the ADF response to this disaster, another C-17 mission was conducted to return Army Sikorsky S-70A-9 Black Hawks to their base at Townsville. During May 2008 a C-17 flew 31 tonnes of emergency equipment from Australia to Yangon in Burma following Cyclone Nargis. Later in the month a RAAF Globemaster transported two Aérospatiale SA 330 Puma helicopters from South Africa to Thailand, from where the helicopters flew into Burma. On 1 October 2009, C-17s transported supplies and ADF evacuation teams from RAAF Base Richmond to Samoa following the earthquake there. Two days later another C-17 sortie delivered medical personnel and other specialists to Padang in Indonesia after the 