diff --git a/scripts/verify-campaign-recruit-data.mjs b/scripts/verify-campaign-recruit-data.mjs
index 1166afe..3558dc1 100644
--- a/scripts/verify-campaign-recruit-data.mjs
+++ b/scripts/verify-campaign-recruit-data.mjs
@@ -42,6 +42,7 @@ try {
   });
 
   validateReachability(errors, recruitTemplates, recruitRewardRefs);
+  validateUniqueRecruitRewards(errors, recruitRewardRefs);
   validateSortieRecruitAvailability(errors, scenarioEntries);
 
   if (errors.length) {
@@ -168,6 +169,17 @@ function validateReachability(errors, recruitTemplates, recruitRewardRefs) {
   });
 }
 
+function validateUniqueRecruitRewards(errors, recruitRewardRefs) {
+  const firstBattleByRecruitId = new Map();
+  recruitRewardRefs.forEach(({ battleId, unitId }) => {
+    if (firstBattleByRecruitId.has(unitId)) {
+      errors.push(`${battleId}: recruit "${unitId}" was already awarded by ${firstBattleByRecruitId.get(unitId)}`);
+      return;
+    }
+    firstBattleByRecruitId.set(unitId, battleId);
+  });
+}
+
 function validateSortieRecruitAvailability(errors, scenarioEntries) {
   const firstBattleAllies = scenarioEntries[0]?.[1]?.units
     ?.filter((unit) => unit.faction === 'ally')