* Presidential Unit Citation , Streamer embroidered PLEIKU PROVINCE    * Presidential Unit Citation , Streamer embroidered DAK TO DISTRICT    * Valorous Unit Award, 1st Squadron, 10th Cavalry Regiment, 4th Infantry Division , Streamer embroidered II Corp Defense    * Republic of Vietnam Cross of Gallantry with Palm, Streamer embroidered VIETNAM 1966-1969   * Republic of Vietnam Cross of Gallantry with Palm, Streamer embroidered VIETNAM 1969-1970   * Republic of Vietnam Civil Action Honor Medal, First Class, Streamer embroidered VIETNAM 1966-1969    * Army Superior Unit Award  for Force XXI Test and Evaluation    * Valorous Unit Award, 1st Brigade Combat Team & Supporting units, 4th Infantry Division, Streamer embroidered with Operation Red Dawn, Iraq - 2003    * Presidential Unit Citation , Streamer embroidered Operation Iraqi Freedom      * Presidential Unit Citation , Streamer embroidered Operation Iraqi Freedom       * Meritorious Unit Commendation , 7th Squadron 10th US Cavalry, Streamer embroidered Iraqi Governance 2004-2005    * Meritorious Unit Commendation , 7th Squadron 10th US Cavalry, Streamer embroidered National Resolution 2005-2007    * Valorous Unit Award, 1st Brigade Combat Team & Supporting units, 4th Infantry Division, Streamer embroidered with Iraqi Surge 2007-2008    * Valorous Unit Award, 1st Brigade Combat Team & Supporting units, 4th Infantry Division, Streamer embroidered with Iraqi Sovereignty 2009-2010

Based on the above article, answer a question. How many years for the Valorous Unit Award?
1