message: SAM Infantry upgrades to Mobile SAM
diff: <bMilitarySupport>1</bMilitarySupport>
  <bMilitaryProduction>1</bMilitaryProduction>
  <bPillage>1</bPillage>
  - <bIgnoreBuildingDefense>1</bIgnoreBuildingDefense>
  + <bIgnoreBuildingDefense>1</bIgnoreBuildingDefense>>
  + <UnitClassUpgrades>
  + <UnitClassUpgrade>
  + <UnitClassUpgradeType>UNITCLASS_MOBILE_SAM</UnitClassUpgradeType>
  + <bUnitClassUpgrade>1</bUnitClassUpgrade>
  + </UnitClassUpgrade>
  + </UnitClassUpgrades>
  <UnitAIs>
  <UnitAI>
  <UnitAIType>UNITAI_COUNTER</UnitAIType>
  