WordNet (r) 3.0 (2006):

serviceman
    n 1: someone who serves in the armed forces; a member of a
         military force; "two men stood sentry duty" [syn:
         serviceman, military man, man, military personnel]
         [ant: civilian]

Moby Thesaurus II by Grady Ward, 1.0:

40 Moby Thesaurus words for "serviceman":
   Amazon, air serviceman, armed forces, brave, cannon fodder,
   cobbler, doctor, fighter, fighting man, fixer, food for powder,
   forces, halberdier, hoplite, legionary, little Miss Fixit,
   maintenance man, man-at-arms, mechanic, mechanician, mender,
   military, military man, navy man, pikeman, renovator, repairer,
   repairman, restorer, rifle, rifleman, soldier, spearman, swaddy,
   sweat, tinker, trouble man, troubleshooter, warrior, warrioress