Armoured fighting vehicle
Self-propelled artillery: Self-propelled artillery vehicles give mobility to artillery. Within the term are covered self-propelled guns (or howitzers) and rocket artillery. They are highly mobile, usually based on tracked chassis carrying either a large howitzer or other field gun or alternatively a mortar or some form of rocket or missile launcher. They are usually used for long-range indirect bombardment support on the battlefield.
In the past, self-propelled artillery has included direct-fire "Gun Motor Carriage" vehicles, such as assault guns and tank destroyers (also known as self-propelled anti-tank guns). These have been heavily armoured vehicles, the former providing danger-close fire-support for infantry and the latter acting as specialized anti-tank vehicles.
Modern self-propelled artillery vehicles may superficially resemble tanks, but they are generally lightly armoured, too lightly to survive in direct-fire combat. However, they protect their crews against shrapnel and small arms and are therefore usually included as armoured fighting vehicles. Many are equipped with machine guns for defence against enemy infantry.
The key advantage of self-propelled over towed artillery is that it can be brought into action much faster. Before towed artillery can be used, it has to stop, unlimber and the guns set up. To move position, the guns must be limbered up again and brought – usually towed – to the new location. By comparison, self-propelled artillery in combination with modern communications, can stop at a chosen location and begin firing almost immediately, then quickly move on to a new position. This ability is very useful in a mobile conflict and particularly on the advance.
Conversely, towed artillery was and remains cheaper to build and maintain. It is also lighter and can be taken to places that self-propelled guns cannot reach, so despite the advantages of the self-propelled artillery, towed guns remain in the arsenals of many modern armies.

Assault gun: An assault gun is a gun or howitzer mounted on a motor vehicle or armoured chassis, designed for use in the direct fire role in support of infantry when attacking other infantry or fortified positions.
Historically, the custom-built fully armoured assault guns usually mounted the gun or howitzer in a fully enclosed casemate on a tank chassis. The use of a casemate instead of a gun turret limited these weapons' field of fire, but allowed a larger gun to be fitted relative to the chassis, more armour to be fitted for the same weight, and provided a cheaper construction. In most cases, these turretless vehicles also presented a lower profile as a target for the enemy.

Self-propelled siege mortar: A siege mortar is a form of self-propelled gun that holds a siege mortar. The only siege mortar ever built was the Karl-Gerät. It could be argued that these could be classified as a Mortar carrier.

Mortar carrier: A mortar carrier is a self-propelled artillery vehicle carrying a mortar as its primary weapon. Mortar carriers cannot be fired while on the move and some must be dismounted to fire. In U.S. Army doctrine, mortar carriers provide close and immediate indirect fire support for maneuver units while allowing for rapid displacement and quick reaction to the tactical situation. The ability to relocate not only allows fire support to be provided where it is needed faster, but also allows these units to avoid counter-battery fire. Mortar carriers have traditionally avoided direct contact with the enemy. Many units report never using secondary weapons in combat.
Prior to the Iraq War, American 120 mm mortar platoons reorganized from six M1064 mortar carriers and two M577 fire direction centres (FDC) to four M1064 and one FDC. The urban environment of Iraq made it difficult to utilize mortars. New technologies such as mortar ballistic computers and communication equipment and are being integrated. Modern era combat is becoming more reliant on direct fire support from mortar carrier machine guns.

Multiple rocket launcher: A multiple rocket launcher is a type of unguided rocket artillery system. Like other rocket artillery, multiple rocket launchers are less accurate and have a much lower (sustained) rate of fire than batteries of traditional artillery guns. However, they have the capability of simultaneously dropping many hundreds of kilograms of explosive, with devastating effect.
The Korean Hwacha is an example of an early weapon system with a resemblance to the modern-day multiple rocket launcher. The first self-propelled multiple rocket launchers – and arguably the most famous – were the Soviet BM-13 Katyushas, first used during World War II and exported to Soviet allies afterwards. They were simple systems in which a rack of launch rails was mounted on the back of a truck. This set the template for modern multiple rocket launchers. The first modern multiple rocket launcher was the German 15 cm Nebelwerfer 41 of the 1930s, a small towed artillery piece. Only later in World War II did the British deploy similar weapons in the form of the Land Mattress.The Americans mounted tubular launchers atop M4 Sherman tanks to create the T34 Calliope rocket launching tank, only used in small numbers, as their closest equivalent to the Katyusha.

Missile vehicle: Missile vehicles are trucks or tractor units designed to carry rockets or missiles. The missile vehicle may be a self-propelled unit, or the missile holder/launcher may be on a trailer towed by a prime mover. They are used in the military forces of a number of countries in the world. Long missiles are commonly transported parallel to the ground on these vehicles, but elevated into an inclined or vertical position for launching.

A Transporter erector launcher (TEL) is a missile vehicle with an integrated prime mover (tractor unit) that can carry, elevate to firing position and launch one or more missiles. Such vehicles exist for both surface-to-air missiles and surface-to-surface missiles.

Tank destroyer: Tank destroyers and tank hunters are armed with an anti-tank gun or anti-tank missile launcher, and are designed specifically to engage enemy armoured vehicles. Many have been based on a tracked tank chassis, while others are wheeled. Since World War II, main battle tanks have largely replaced gun-armed tank destroyers; although lightly armoured anti-tank guided missile (ATGM) carriers are commonly used for supplementary long-range anti-tank engagements.
In post-Cold War conflict, the resurgence of expeditionary warfare has seen the emergence of gun-armed wheeled vehicles, sometimes called "protected gun systems", which may bear a superficial resemblance to tank destroyers, but are employed as direct fire support units typically providing support in low intensity operations such as Iraq and Afghanistan. These have the advantage of easier deployment, as only the largest air transports can carry a main battle tank, and their smaller size makes them more effective in urban combat.
Many forces' IFVs carry anti-tank missiles in every infantry platoon, and attack helicopters have also added anti-tank capability to the modern battlefield. But there are still dedicated anti-tank vehicles with very heavy long-range missiles, or intended for airborne use. There have also been dedicated anti-tank vehicles built on ordinary armoured personnel carrier or armoured car chassis. Examples include the U.S. M901 ITV (Improved TOW Vehicle) and the Norwegian NM142, both on an M113 chassis, several Soviet ATGM launchers based on the BRDM scout car, the British FV438 Swingfire and FV102 Striker and the German Raketenjagdpanzer series built on the chassis of the HS 30 and Mardar IFVs.

Armoured train: An armoured train is a railway train protected with armour. They are usually equipped with rail cars armed with artillery, autocannons, machine guns, tank turrets and anti-aircraft guns. They were mostly used during the late 19th to mid-20th century, when they offered an innovative way to quickly move large amounts of firepower. Their use was discontinued in most countries when road vehicles became much more powerful and offered more flexibility, and because armoured trains were too vulnerable to track sabotage and attacks from the air. However, the Russian Federation used improvised armoured trains in the Second Chechen War in the late 1990s and 2000s. Armoured trains carrying ballistic missiles have also been used.
The rail cars on an armoured train were designed for many tasks, such as carrying artillery and machine guns, infantry units, anti-tank and anti-aircraft guns. During World War II, the Germans would sometimes put a Fremdgerät (captured AFVs such as the French Somua S-35 or Czech PzKpfw 38(t)), or obsolescent Panzer II light tanks on a flatbed rail car, which could quickly be offloaded by means of a ramp and used away from the railway line to chase down enemy partisans.
Different types of armour were used to protect armoured trains from attack. In addition to various metal plates, concrete and sandbags were used in some cases on armoured trains.
Armoured trains were sometimes escorted by a kind of rail-tank called a draisine. One such example was the Italian 'Littorina' armoured trolley, which had a cab in the front and rear, each with a control set so it could be driven down the tracks in either direction. Littorina mounted two dual 7.92mm MG13 machine gun turrets from Panzer I light tanks.

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Sources: Gougaud, Alain (1987).