A generic term used to describe non-laser directed-energy weapons that project some type of particle as opposed to a physical projectile. Beam weapons damage targets via kinetic force and heat and are also versatile weapons operable within an atmosphere, underwater or in space. The most common type of beam weapon is the converging energy beam cannon used as the main gun for many large military space ships (see Super-Dimension-Energy Cannon) or as weapons on variable fighters. Many different types of beam weapons exist such as the Mauler RO-X2A high-powered double-action beam cannon (found on the VF-1S Strike Valkyrie), large beam cannons (found on the VF-4 Lightning III), the Mauler REB-20G converging energy cannons (found on the YF-19), the small-bore rear anti-aircraft beam gun (found on the VF-19A, VF-19F and VF-19S Excalibur), the high-powered converging energy cannon (found on the VF-22 Sturmvogel II), the Mauler RÖV-217C coaxial 12.7mm beam guns or the Mauler RÖV-25 25mm beam machine guns (on the VF-25 Messiah) and the BGP-01β 55mm beam gun pod / high-powered beam grenade (on the VF-27 Lucifer). Beam weapons may also be described as simply "Beam Gun" or other names such as particle cannons and electron beam guns.