WordNet (r) 3.0 (2006):

combat fatigue
    n 1: a mental disorder caused by stress of active warfare [syn:
         battle fatigue, combat fatigue, combat neurosis,
         shell shock]

Moby Thesaurus II by Grady Ward, 1.0:

44 Moby Thesaurus words for "combat fatigue":
   accident neurosis, anaphylactic shock, anxiety hysteria,
   anxiety neurosis, association neurosis, battle fatigue,
   blast neurosis, compensation neurosis, compulsion neurosis,
   conversion hysteria, conversion neurosis, expectation neurosis,
   fixation neurosis, fright neurosis, homosexual neurosis,
   hypochondria, hypochondriasis, hypoglycemic shock, hysteria,
   mental shock, neurogenic shock, neurosis, neuroticism,
   obsessional neurosis, occupational neurosis, pathoneurosis, phobia,
   protein shock, psychasthenia, psychoneurosis,
   psychoneurotic disorder, psychopathia martialis,
   regression neurosis, secondary shock, serum shock, shell shock,
   shock, situational neurosis, surgical shock, thanatosis, trauma,
   traumatism, war neurosis, wound shock