The M136 AT4 is a portable, shoulder-fired anti-tank weapon used by military forces. It is a single-shot, disposable launcher designed to engage armored vehicles and fortifications. The AT4 is lightweight, making it easy for soldiers to carry and operate in various combat situations. This weapon fires a 84mm high-explosive anti-tank (HEAT) round, which can penetrate armor effectively. The M136 AT4 is commonly used by infantry units and is known for its simplicity and reliability. It is part of the broader category of anti-tank weapons, which includes systems like the Javelin and RPG.