This article is considered accurate for the current version (1.54) of the game.
While the Noble Firebrand Mk. XVII is a deadly flamethrower tank, a more efficient means of employing flame weapons was needed. Enter the Wild Jack. Named for the fiery idols made by children for Dead Harvest, the Wild Jack is a variation of the Highlander.
— In-game description
The O'Brien V.130 Wild Jack (also known as a Flame Armored Car or Flame AC) is a WardenArmored Car with improved off-road mobility and equipped with a flamethrower.
The O'Brien V.130 Wild Jack has 900 HP and is disabled under 30% health. It has "Light Armor" resistance: it can soak small arms fire and shrapnel, and it is immune to Flamethrowers. But it won't last long when faced with 12.7mm machine guns, heavy explosives, or anti-tank weaponry. It has Tank Armor. With it, in best case scenario, penetrating projectiles only have a 85% chance of penetrating and doing damage. That chance goes up quickly if the armor is worn or if it is shot from up close, or on the side or rear from a direct angle, or with ammo that has penetration bonuses. It takes 115 Basic Materials to fully repair it from 1% to 100% health with a Hammer. Its health and Tank Armor can be instantly repaired at a Garage for 100 Basic Materials.
The O'Brien V.130 Wild Jack is a lightly armored car designed to combat infantry and light structures on fire. In terms of mobility, it has decent on-road speed and slightly worse off-road speed, which gives it greater flexibility in where it can effectively fight (in addition to its movement not being affected by snow storms). Along with its slow-turning turret, it is better to stay on roads so the crew can react faster if they're being flanked (though this is slightly mitigated). Additionally, due to its low health, a single anti-tank mine will nearly destroy it.
Its main armament, the flamethrower, is a niche tool. When used directly against infantry, it can become one of the fastest kill tools (right behind explosions, which will instantly kill a player). While it is tempting to charge hunkering infantry, it's better to flush them out with fire and heat. The near-nonexistent damage and quick emptying of a canister forces the crew to conserve ammunition against flammable targets. Setting enemy structures ablaze will also deny enemy infantry their use, slowly damaging it and preventing them from repairing it.
AC Effectiveness over the Course of the War
Similar to all armored cars, as soon as heavier anti-armor weapons become more common, (such as anti-tank rifles) the O'Brien V.130 Wild Jack loses most of its relevance on the front line, as they will quickly be destroyed, as longer ranged weapons prevent the crew from reacting fast enough before being destroyed. However, due to its armament, it is still a formidable opponent when operated by a competent crew.