demob-happy

adjective
  1. feeling elated in anticipation of demobilization from the armed forces
  2. feeling elated and carefree in anticipation of the end of any onerous or unpleasant period
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012