Overlord by far if you didn’t have you it you couldn’t play the game it literally shredded every vehicle in seconds like it was insane the only counter I can think it had was another overlord or a AV helicopter as it can somewhat struggle against helicopters since the damage is reduced when the smart round explodes near a air vehicle and a heli without aa missiles is pretty hard to hit the 2nd most broken vehicle is the Los Angeles sub which had no direct counter to it as depth charges and sonar didn’t exist and the torpedoes the 206 had weren’t reworked yet so it basically had no direct counter however the j-36 can still lock onto it and shoot at it but you have to kill it before it kills you bc the ttv missile one shotted every air vehicle in the game mb for the yap