Features:

NEW: 

Each player can have only one active helicopter at a time; all helicopter requests remain disabled until the current helicopter is decommissioned or destroyed. Players are notified when the restriction is active, with a short cooldown to prevent message spam.

Building UI integration 
Vehicle cards are automatically disabled when a limit is reached 
No vehicle preview for blocked vehicles 
Existing notification system 
Ground vehicle limits 
Helicopter limits 
Individual prefab limits 
Prefab group limits 
Per-faction or global limits 
Pre-placed map vehicles are ignored 
Game Master is not affected 
Configuration reloads automatically

Example config:

{
  "faction_a_ground_limit": 12,
  "faction_b_ground_limit": 12,

  "faction_a_helicopter_limit": 4,
  "faction_b_helicopter_limit": 4,

  "prefab_limits": [
    {
      "prefab": "{GUID}Prefabs/Vehicles/Helicopters/UH1H/UH1H_Conflict.et",
      "limit": 2,
      "per_faction": true
    }
  ],

  "prefab_groups": [
    {
      "name": "Heavy Armor",
      "limit": 1,
      "per_faction": true,
      "prefabs": [
        "{GUID}Prefabs/Vehicles/BMP/BMP_Conflict.et",
        "{GUID}Prefabs/Vehicles/T72/T72_Conflict.et",
        "{GUID}Prefabs/Vehicles/M1A1/M1A1_Conflict.et"
      ]
    }
  ]
}

Notes:
Prefab limits apply only to the specified vehicle. 
Prefab groups allow multiple vehicles to share a common limit. 
Only vehicles spawned through the Building system are counted. 
Vehicles placed on the map are ignored.

RemBois - Vehicle Limiter

Limits the number of vehicles that can be deployed through the Campaign Building system.

RemBois - Vehicle Limiter

1.0.4

1.0.3

1.0.2

1.0.1

1.0.0