diff --git a/resources/units/aircraft/S-3B Tanker.yaml b/resources/units/aircraft/S-3B Tanker.yaml
index 5153b8d0..990c1a61 100644
--- a/resources/units/aircraft/S-3B Tanker.yaml	
+++ b/resources/units/aircraft/S-3B Tanker.yaml	
@@ -14,6 +14,7 @@ introduced: 1984
 manufacturer: Lockheed
 origin: USA
 price: 20
+max_group_size: 1
 role: Carrier-based Tanker
 variants:
   S-3B Tanker: {}
diff --git a/resources/units/aircraft/S-3B.yaml b/resources/units/aircraft/S-3B.yaml
index e457bdaa..c85bc712 100644
--- a/resources/units/aircraft/S-3B.yaml
+++ b/resources/units/aircraft/S-3B.yaml
@@ -15,7 +15,6 @@ introduced: 1984
 manufacturer: Lockheed
 origin: USA
 price: 10
-max_group_size: 1
 role: Carrier-based Attack
 variants:
   S-3B Viking: {}