 Complete the following phrase:  From AprilOctober 2001, a composite engineer troop was deployed to support the 4 RAR Battalion Group in East Timor and undertook a wide variety of construction and combat engineering tasks along the border between East and West Timor. During November 2003  June 2004, 2 CER supported the 6 RAR Battalion Group AUSBATT IX in East Timor. 2 CER subsequently led an independent Company Group in support of a multi-national United Nations Security Force as part of Operation SPIRE during the period December 2004  June 2005. This force conducted a wide variety of support engineering and combat service support tasks in support of other United Nations forces deployed to the country. 2 CER elements returned to Timor Leste in the a href8th9th20Battalion2C20Royal20Australian20Regiment89 RARa Timor-Leste Battle Group from January October 2010, as part of 