The skill improvement rules (pg. 40-41) specify tracking experience for "each warrior who survives a scenario." I'd interpret this as meaning the warrior himself/herself simply survived (wasn't killed), but the question arose in a game today of whether to include warriors who lost their 'mechs in the scenario as receiving experience and being eligible to receive their side's bonus experience point. As a related side question, does being taken prisoner (after a failed search and rescue check per CO pg. 223) affect the answer?