The AT4 is a disposable recoilless weapons system that fires an 84mm HEAT (High Explosive Anti-Tank) rocket capable of destroying light armored vehicles. The HEAT round is capable of penetrating 420mm of armor. In addition to the HEAT round, the AT4 is capable of firing a HP (High Penetration) round that is capable of penetrating up to 600mm of armor, which is sufficient to penetrate the armor of most main battle tanks. The AT4 available to the Ghosts is equipped with a scope to allow soldiers to zoom in their targets.
The AT4 is the result of a joint development plan by Saab Bofors Dynamics(Sweden) and ATK Inc.(USA) for a new lightweight, disposable Anti-Tank weapon in the 1980s. It was adopted by the U.S. Army as the M136 LAW replacing the M72 LAW. The original AT4 fired 84mm HEAT warheads and there're other variants that can fire different warheads such HEDP rounds. A mount that can accept most 2x or 4x sights made for such weapons can be fitted to improve accuracy and effectiveness. This rocket launcher is non-reloadable.
- The AT4 appears in Ghost Recon and it's expansions as the M136. It is replaced by the M3A2 in Tom Clancy's Ghost Recon 2.
- Strangely the AT4 can be reloaded in-game unlike it's real life counter part.