Air force ground forces and special forces are the land warfare forces of an air force. They may include infantry, special forces, security forces, and military police. Airmen assigned to such units may be trained, armed and equipped for ground combat and special operations.
Rationale
Traditionally the primary rationale for air force ground forces is for force protection. Aircraft are most vulnerable when on the ground, to offensive counter air operations, and most cannot operate without fixed infrastructure, consumables, and trained personnel. An adversary may hope to achieve air supremacy or protect itself from air attack first by attacking airbases, aircraft and other assets on the ground. Such attacks can be made by, for example, aircraft, cruise missiles and short range ballistic missiles. However, an adversary at a numerical, technological or other disadvantage may choose to attempt to disrupt flight operations by aiming to overrun or raid enemy air bases as early as possible, using blitzkrieg like tactics, for example Operation Barbarossa, or through the use of special forces and unconventional attacks, such as the Taliban raid on Camp Bastion.
To protect against attacks against airbases, and from being overrun, some air forces have a force dispersal doctrine that sees aircraft dispersed to secondary and emergency air bases, such as highway strips, and, as was the case with the Royal Air Force's vertical take off Harriers, dispersals in forest clearings or the Bas 60 and Bas 90 systems of the Swedish Air Force. However, when dispersed in such a way, aircraft and personnel are even more vulnerable to ground attacks.
To defend against ground attacks, most air forces train certain airmen in basic weapons handling skills and tactics; some train units as infantry.
Other than base and asset defence roles, air force ground forces may have other roles such as Chemical, Biological, Radiological and Nuclear (CBRN) defence, training other air force personnel in weapon skills and basic ground defence tactics, traditional combat operations, as well as providing leadership to other airmen in base defence roles. In addition to protecting their home bases and dispersals, air force ground forces will also provide force protection when air expeditionary forces are deployed abroad and of airheads during air bridge operations, usually being some of the first air force personnel on the ground. Moving towards the special operations spectrum of operations, is assaulting, capturing and securing of airfields for use by one's own aircraft.
Not all air forces possess their own ground units and whether or not they do or is sometimes due to other factors such as political considerations and inter-service rivalry. Such units act as a force multiplier allowing the secure operation of forward airbases and thereby increasing the availability and responsiveness of aviation assets.
Special forces
Some air forces also possess special forces, who perform roles on land in support of air force operations. These include units and individual personnel who operate independently or, with other military units.
The chief missions in such units are combat search and rescue, including rescuing downed aircrews in hostile territory; long-range reconnaissance, direct action and forward air control in support of air to ground operations, for example illuminating targets for attack by laser-guided bombs.
Other common roles include military weather forecasting, pathfinding, domestic counter terrorism and hostage rescue missions; capturing airbases, establishing advanced airfields and conducting air traffic control.
Doctrine
In most forces a layered approach is used to deliver a defense in depth. Peacetime doctrine is to maintain the integrity of the perimeter through the use of watch posts and/or remote sensors, and if deemed necessary patrols within the perimeter. In the event of the perimeter being penetrated, heavily armed and mobile fast response units, often using armored vehicles, will attempt to intercept, identify and if necessary suppress the incursion. If attackers manage to gain entry into the working areas of the airbase, by subterfuge or other means, then the role of air force ground forces is to remove them using close quarter battle.
Wartime doctrine, in for example the RAF Regiment and USAF Security Forces, sees the addition of another layer through the use of aggressive patrolling outside the perimeter to deter, detect and destroy would be attackers. The area around the airbase is mapped and prearranged fire plans are put in place to allow patrols to call down rapid and accurate indirect fire from attached mortars and other crew served weapons.