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Units with transport and combat vehicles

Mechanized infantry are infantry units equipped with armored personnel carriers (APCs) or infantry fighting vehicles (IFVs) for transport and combat (see also armoured corps). As defined by the United States Army, mechanized infantry is distinguished from motorized infantry in that its vehicles provide a degree of armor protection and armament for use in combat, whereas motorized infantry are provided with "soft skinned" wheeled vehicles for transportation only. Most APCs and IFVs are fully tracked or are all wheel drive vehicles (6×6 or 8×8), for mobility across rough ground. Some militaries distinguish between mechanized and armored (or armoured) infantry, designating troops carried by APCs as mechanized and those in IFVs as armored. The support weapons for mechanized infantry are also provided with motorized transport, or they are built directly into combat vehicles to keep pace with the mechanized infantry in combat. For units equipped with most types of APC or any type of IFV, fire support weapons, such as machine guns, autocannons, small bore direct fire howitzers, and anti tank guided missiles are often mounted directly on the infantry's own transport vehicles. Compared with "light" truck mobile infantry, mechanized infantry can maintain rapid tactical movement and, if mounted in IFVs, have more integral firepower. They require more combat supplies (ammunition and especially fuel) and ordnance supplies (spare vehicle components), and a comparatively larger proportion of manpower is required to crew and maintain the vehicles. For example, most APCs mount a section of seven or eight infantrymen but have a crew of two. Most IFVs carry only six or seven infantry but require a crew of three. To be effective in the field, mechanized units also require many mechanics, with specialized maintenance and recovery vehicles and equipment.

As early as 1915 the British instigated a tracked vehicle that could carry 50 equipped troops under armour but the project got no further than trials before cancellation. Some of the first mechanized infantry were German assault teams mounted on A7V tanks during World War I. The vehicles were extra large to let them carry sizeable assault teams and would regularly carry infantry on board in addition to their already large crews that were trained as stormtroopers. All machine gun armed A7V tanks carried two small flamethrowers for their dismounts to use. A7V tank would often carry a second officer to lead the assault team. During the Battle of St. Quentin in late March 1918, A7Vs were accompanied by twenty stormtroopers from Rohr Assault Battalion, but it is unspecified if they were acting as dismounts or were accompanying the tanks on foot. During the battle, tank crews were reported to have dismounted and attacked enemy positions with grenades and flamethrowers on numerous occasions. Another example of the use of such a method of fighting is the capture of Villers Bretonneux, in which A7Vs would suppress the defenders with machine gun fire and assault teams would dismount and attack them with grenades. The British heavy tank design was given an extended hull to cross wide German trenches. This Mark V** had space for fourteen troops. The Mark IX tank based on the Mark V was designed solely for carrying troops with space for 30 but the war ended before the order was complete and they could be used. Towards the end of World War I, all the armies involved were faced with the problem of maintaining the momentum of an attack. Tanks, artillery, or infiltration tactics could all be used to break through an enemy defense, but almost all offensives launched in 1918 ground to a halt after a few days. The following infantry quickly became exhausted, and artillery, supplies and fresh formations could not be brought forward over the battlefields quickly enough to maintain the pressure on the regrouping enemy forces. It was widely acknowledged that cavalry was too vulnerable to be used on most European battlefields, but many armies continued to deploy them. Motorized infantry could maintain rapid movement, but their trucks required either a good road network or firm open terrain, such as desert. They were unable to traverse a battlefield obstructed by craters, barbed wire, and trenches. Tracked or all wheel drive vehicles were to be the solution. Following the war, development of mechanized forces was largely theoretical for some time, but many nations began rearming in the 1930s. The British Army had established an Experimental Mechanized Force in 1927, but it failed to pursue that line because of budget constraints and the prior need to garrison the frontiers of the British Empire. Although some proponents of mobile warfare, such as J. F. C. Fuller, advocated building "tank fleets", other, such as Heinz Guderian in Germany, Adna R. Chaffee Jr. in the United States, and Mikhail Tukhachevsky in the Soviet Union, recognized that tank units required close support from infantry and other arms and that such supporting arms needed to maintain the same pace as the tanks. As the Germans rearmed in the 1930s, they equipped some infantry units in their new Panzer divisions with the half track Sd. Kfz. 251, which could keep up with tanks on most terrain. The French Army also created "light mechanized" (légère mécanisée) divisions in which some of the infantry units possessed small tracked carriers. Together with the motorization of the other infantry and support units, this gave both armies highly mobile combined arms formations. The German doctrine was to use them to exploit breakthroughs in Blitzkrieg offensives, whereas the French envisaged them being used to shift reserves rapidly in a defensive battle.

As World War II progressed, most major armies integrated tanks or assault guns with mechanized infantry, as well as other supporting arms, such as artillery and combat engineers, as combined arms units. Allied armored formations included a mechanized infantry element for combined arms teamwork. For example, US armored divisions had a balance of three battalions each of tanks, armored infantry, and self propelled artillery. The US armored infantry was fully equipped with M2 and M3 halftracks. In the British and Commonwealth armies, "Type A armoured brigades," intended for independent operations or to form part of armored divisions, had a "motor infantry" battalion mounted in Universal Carriers or later in lend lease halftracks. "Type B" brigades lacked a motor infantry component and were subordinated to infantry formations. The Canadian Army and, subsequently the British Army, used expedients such as the Kangaroo APC, usually for specific operations rather than to create permanent mechanized infantry formations. The first such operation was Operation Totalize in the Battle of Normandy, which failed to achieve its ultimate objectives but showed that mechanized infantry could incur far fewer casualties than dismounted troops in set piece operations. The German Army, having introduced mechanized infantry in its Panzer divisions, later named them Panzergrenadier units. In the middle of the war, it created entire mechanized infantry divisions and named Panzergrenadier divisions. Because the German economy could not produce adequate numbers of its half track APC, barely a quarter or a third of the infantry in Panzer or Panzergrenadier divisions were mechanized, except in a few favored formations. The rest were moved by truck. However, most German reconnaissance units in such formations were also primarily mechanized infantry and could undertake infantry missions when it was needed. The Allies generally used jeeps, armored cars, or light tanks for reconnaissance. The Red Army began the war while still in the process of reorganizing its armored and mechanized formations, most of which were destroyed during the first months of the German Invasion of the Soviet Union. About a year later, the Soviets recreated division sized mechanized infantry units, termed mechanized corps, usually with one tank brigade and three mechanized infantry brigades, with motorized supporting arms. They were generally used in the exploitation phase of offensives, as part of the prewar Soviet concept of deep operations. The Soviet Army also created several cavalry mechanized groups in which tanks, mechanized infantry and horsed cavalry were mixed. They were also used in the exploitation and pursuit phases of offensives. Red Army mechanized infantry were generally carried on tanks or trucks, with only a few dedicated lend lease half track APCs. The New Zealand Army ultimately fielded a division of a roughly similar composition to a Soviet mechanized corps, which fought in the Italian Campaign, but it had little scope for mobile operations until near the end of the war. The Romanian Army fielded a mixed assortment of vehicles. These amounted to 126 French designed Renault UE Chenillettes which were licence built locally, 34 captured and refurbished Soviet armored tractors, 27 German made armored half tracks of the Sd. Kfz. 250 and Sd. Kfz. 251 types, over 200 Czechoslovak Tatra, Praga and Skoda trucks (the Tatra trucks were a model which was specifically built for the Romanian Army) as well as 300 German Horch 901 4x4 field cars. Sd. Kfz. 8 and Sd. Kfz. 9 half tracks were also acquired, as well as nine vehicles of the Sd. Kfz. 10 type and 100 RSO/01 fully tracked tractors. The Romanians also produced five prototypes of an indigenous artillery tractor.

At present, almost all infantry units from industrialized nations are provided with some type of motor transport. Infantry units equipped with IFVs rather than lighter vehicles are commonly designated as "heavy", indicating more combat power but also more costly long range transportation requirements. In Operation Desert Shield, during the buildup phase of the First Gulf War, the U. S. Army was concerned about the lack of mobility, protection and firepower offered by existing rapid deployment (i. e., airborne) formations; and also about the slowness of deploying regular armored units. The experience led the U. S. Army to form combat brigades based on the Stryker wheeled IFV. In the British Army, "heavy" units equipped with the Warrior IFV are described as "armoured infantry", and units with the Bulldog APC as "mechanised infantry". This convention is becoming widespread; for example the French Army has "motorisées" units equipped with the wheeled VAB and "mécanisées" units with the tracked AMX 10P. The transport and other logistic requirements have led many armies to adopt wheeled APCs when their existing stocks of tracked APCs require replacement. An example is the Canadian Army, which has used the LAV III wheeled IFV in fighting in Afghanistan. The Italian, Spanish and Swedish armies are adopting (and exporting) new indigenous produced tracked IFVs. The Swedish CV90 IFV in particular has been adopted by several armies. A recent trend seen in the Israel Defense Forces and the Armed Forces of the Russian Federation is the development and introduction of exceptionally well armored APCs (HAPC), such as the IDF Achzarit, that are converted from obsolete main battle tanks (such as the Soviet T 55). Such vehicles are usually expedients, and lack of space prevents the armament of an IFV being carried in addition to an infantry section or squad. In the Russian Army, such vehicles were introduced for fighting in urban areas, where the risk from short range infantry anti tank weapons, such as the RPG 7, is highest, after Russian tank and motor infantry units suffered heavy losses fighting Chechen troops in Grozny during the First Chechen War in 1995. Many APCs and IFVs currently under development are intended for rapid deployment by aircraft. New technologies that promise reduction in weight, such as electric drive, may be incorporated. However, facing a similar threat in post invasion Iraq to that which prompted the Russians to convert tanks to APCs, the occupying armies have found it necessary to apply extra armor to existing APCs and IFVs, which adds to the overall size and weight. Some of the latest designs (such as the German Puma) are intended to allow a light, basic model vehicle, which is air transportable, to be fitted in the field with additional protection, thereby ensuring both strategic flexibility and survivability.

In the late Cold War and early 21st century, various countries developed medium infantry forces armed with armored vehicles, which typically consisted of wheeled armored personnel carriers, infantry fighting vehicles, and assault guns. Medium mechanized forces are characterized by having more strategic air and road mobility than heavier, tank based armored forces while offering better armor protection for the formation than the lighter motorized infantry formation, in which vehicles were considered "battle taxis" due to poor protection. The earliest experiment was the short lived Soviet Light Motor Rifle Division in 1987, which consisted of wheeled BTR platforms for its primary armament. In the 1990s, the United States explored Stryker Brigade Combat Team (SBCT) formation and doctrines, which was a medium mechanized infantry formation with all wheeled platforms centered around Stryker armored personnel carrier. In the early 21st century, China reformed its ground forces with the concept called Medium Combined Arms Brigade (CA BDE), armed with Type 08 universal wheeled platform. A similar trend of adopting the medium mechanized forces was observed in European countries, including the Italian, Polish, and French armed forces.

It is generally accepted that single weapons system types are much less effective without the support of the full combined arms team; the pre World War II notion of "tank fleets" has proven to be as unsound as the World War I idea of unsupported infantry attacks. Though many nations' armored formations included an organic mechanized infantry component at the start of World War II, the proportion of mechanized infantry in such combined arms formations was increased by most armies as the war progressed. The lesson was re learned, first by the Pakistani Army in the 1965 war with India, where the nation fielded two different types of armored divisions: one which was almost exclusively armor (the 1st), while another was more balanced (the 6th). The latter division showed itself to be far more combat capable than the former. Having achieved spectacular successes in the offensive with tank heavy formations during the Six Day War, the Israel Defense Forces found in the Yom Kippur War of 1973 that a doctrine that relied primarily on tanks and aircraft had proven inadequate. As a makeshift remedy, paratroopers were provided with motorized transport and used as mechanized infantry in coordination with the armor.