Index: binaries/data/mods/public/simulation/components/Attackable.js
===================================================================
--- /dev/null
+++ binaries/data/mods/public/simulation/components/Attackable.js
@@ -0,0 +1,11 @@
+function Attackable() {}
+
+Attackable.prototype.Schema = "<empty/>";
+
+Attackable.prototype.Init = function()
+{
+};
+
+Attackable.prototype.Serialize = null;
+
+Engine.RegisterComponentType(IID_Attackable, "Attackable", Attackable);
Index: binaries/data/mods/public/simulation/components/BuildingAI.js
===================================================================
--- binaries/data/mods/public/simulation/components/BuildingAI.js
+++ binaries/data/mods/public/simulation/components/BuildingAI.js
@@ -139,8 +139,8 @@
 
 	var range = cmpAttack.GetRange(attackType);
 	this.enemyUnitsQuery = cmpRangeManager.CreateActiveParabolicQuery(
-			this.entity, range.min, range.max, range.elevationBonus,
-			enemies, IID_Resistance, cmpRangeManager.GetEntityFlagMask("normal"));
+		this.entity, range.min, range.max, range.elevationBonus,
+		enemies, IID_Attackable, cmpRangeManager.GetEntityFlagMask("normal"));
 
 	cmpRangeManager.EnableActiveQuery(this.enemyUnitsQuery);
 };
Index: binaries/data/mods/public/simulation/components/DelayedDamage.js
===================================================================
--- binaries/data/mods/public/simulation/components/DelayedDamage.js
+++ binaries/data/mods/public/simulation/components/DelayedDamage.js
@@ -76,7 +76,7 @@
 
 	// If we didn't hit the main target look for nearby units.
 	let ents = Attacking.EntitiesNearPoint(Vector2D.from3D(data.position), this.MISSILE_HIT_RADIUS,
-		Attacking.GetPlayersToDamage(data.attackerOwner, data.friendlyFire));
+		Attacking.GetPlayersToDamage(data.attackerOwner, data.friendlyFire), IID_Attackable);
 
 	for (let ent of ents)
 	{
Index: binaries/data/mods/public/simulation/components/Resistance.js
===================================================================
--- binaries/data/mods/public/simulation/components/Resistance.js
+++ binaries/data/mods/public/simulation/components/Resistance.js
@@ -43,7 +43,7 @@
 			"</Damage>" +
 		"</Entity>" +
 	"</a:example>" +
-	"<zeroOrMore>" +
+	"<oneOrMore>" +
 		"<choice>" +
 			"<element name='Foundation' a:help='Resistance of an unfinished structure (i.e. a foundation).'>" +
 				Resistance.prototype.BuildResistanceSchema() +
@@ -52,7 +52,7 @@
 				Resistance.prototype.BuildResistanceSchema() +
 			"</element>" +
 		"</choice>" +
-	"</zeroOrMore>";
+	"</oneOrMore>";
 
 Resistance.prototype.Init = function()
 {
Index: binaries/data/mods/public/simulation/components/UnitAI.js
===================================================================
--- binaries/data/mods/public/simulation/components/UnitAI.js
+++ binaries/data/mods/public/simulation/components/UnitAI.js
@@ -3772,7 +3772,7 @@
 		return;
 
 	let range = this.GetQueryRange(IID_Attack);
-	this.losAttackRangeQuery = cmpRangeManager.CreateActiveQuery(this.entity, range.min, range.max, players, IID_Resistance, cmpRangeManager.GetEntityFlagMask("normal"));
+	this.losAttackRangeQuery = cmpRangeManager.CreateActiveQuery(this.entity, range.min, range.max, players, IID_Attackable, cmpRangeManager.GetEntityFlagMask("normal"));
 
 	if (enable)
 		cmpRangeManager.EnableActiveQuery(this.losAttackRangeQuery);
Index: binaries/data/mods/public/simulation/components/interfaces/Attackable.js
===================================================================
--- /dev/null
+++ binaries/data/mods/public/simulation/components/interfaces/Attackable.js
@@ -0,0 +1 @@
+Engine.RegisterInterface("Attackable");
Index: binaries/data/mods/public/simulation/components/tests/test_Damage.js
===================================================================
--- binaries/data/mods/public/simulation/components/tests/test_Damage.js
+++ binaries/data/mods/public/simulation/components/tests/test_Damage.js
@@ -1,6 +1,7 @@
 Engine.LoadHelperScript("Attacking.js");
 Engine.LoadHelperScript("Player.js");
 Engine.LoadHelperScript("ValueModification.js");
+Engine.LoadComponentScript("interfaces/Attackable.js");
 Engine.LoadComponentScript("interfaces/DelayedDamage.js");
 Engine.LoadComponentScript("interfaces/Health.js");
 Engine.LoadComponentScript("interfaces/Loot.js");
Index: binaries/data/mods/public/simulation/components/tests/test_UnitAI.js
===================================================================
--- binaries/data/mods/public/simulation/components/tests/test_UnitAI.js
+++ binaries/data/mods/public/simulation/components/tests/test_UnitAI.js
@@ -2,6 +2,7 @@
 Engine.LoadHelperScript("Entity.js");
 Engine.LoadHelperScript("Player.js");
 Engine.LoadHelperScript("Sound.js");
+Engine.LoadComponentScript("interfaces/Attackable.js");
 Engine.LoadComponentScript("interfaces/Auras.js");
 Engine.LoadComponentScript("interfaces/Builder.js");
 Engine.LoadComponentScript("interfaces/BuildingAI.js");
Index: binaries/data/mods/public/simulation/helpers/Attacking.js
===================================================================
--- binaries/data/mods/public/simulation/helpers/Attacking.js
+++ binaries/data/mods/public/simulation/helpers/Attacking.js
@@ -290,7 +290,7 @@
 Attacking.prototype.CauseDamageOverArea = function(data)
 {
 	let nearEnts = this.EntitiesNearPoint(data.origin, data.radius,
-		this.GetPlayersToDamage(data.attackerOwner, data.friendlyFire));
+		this.GetPlayersToDamage(data.attackerOwner, data.friendlyFire), IID_Attackable);
 	let damageMultiplier = 1;
 
 	let cmpObstructionManager = Engine.QueryInterface(SYSTEM_ENTITY, IID_ObstructionManager);
Index: binaries/data/mods/public/simulation/templates/template_structure.xml
===================================================================
--- binaries/data/mods/public/simulation/templates/template_structure.xml
+++ binaries/data/mods/public/simulation/templates/template_structure.xml
@@ -1,6 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
 <Entity>
   <AIProxy/>
+  <Attackable/>
   <BuildRestrictions>
     <PlacementType>land</PlacementType>
     <Territory>own</Territory>
Index: binaries/data/mods/public/simulation/templates/template_unit.xml
===================================================================
--- binaries/data/mods/public/simulation/templates/template_unit.xml
+++ binaries/data/mods/public/simulation/templates/template_unit.xml
@@ -1,6 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
 <Entity>
   <AIProxy/>
+  <Attackable/>
   <Cost>
     <Population>1</Population>
     <PopulationBonus>0</PopulationBonus>