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Not to be confused with Unlocks (Battlefield 2) or Unlocks (Battlefield 2142).

Weapon lock is a system that alerts the user of a guided projectile weapon that automatic tracking of a target vehicle has been acquired, and that the fired round will follow the target to the best of its ability.

In the modern- and future-era Battlefield games, all vehicles except light ground transports and non-combat vehicles (such as the Skid Loader) have some sort of warning system that detects the use of guided weaponry. The system uses a visual indicator and an audible klaxon.

Battlefield Vietnam[]


The F-4 Phantom, M.U.T.T., alongside the gunner seats of the Ka-25 Hormone and Cobra have missiles that can lock onto air and land vehicles alike. In addition, the SA-7 issued to both the NVA and Viet Cong will also lock onto aircraft.

Projectiles with heat seeking capabilities will have less tracking capabilities against ground vehicles compared to air vehicles.


The user is not notified when a weapon locks onto a vehicle, and the weapons lock onto friendly vehicles as well as enemy ones. Special attention is required when using weapon lock in an area where friendly and enemy vehicles are close to each other.

Battlefield 2[]


Anti-air emplacements (Stinger, IGLA and the USS Essex), anti-air vehicles (Linebacker, PGZ-95 and Tunguska) and fixed-wing aircraft (fighters and bombers, not including those from the Armored Fury booster pack) have heat-seeking missiles that can lock onto enemy aircraft. The user of these systems can see three types of labels on aircraft:

  • All enemy aircraft is shown with a basic shape (square or circle), and the nearest one will be locked on.
  • Friendly aircraft is marked with "X" and will not be locked on.
  • The currently locked aircraft is shown with a label marked "SHOOT" and a line connecting the crosshair to that label.

The second position of bombers can use laser guided weapons against land vehicles. The mechanism for weapon lock is similar to that for heat-seeking missiles, however, it is necessary for the aircraft to remain relatively still for a while before the enemy vehicle can be locked on.


Aircraft that has become target of weapon lock can use flares, redirecting the lock there. Heat-seeking missiles will also lock onto heat sources in the environment (such as a fire) and care is necessary when engaged in a dogfight in those areas, to ensure that the missile is locked onto the right source.

Battlefield 2142[]


Only the anti-air weapons (SAAW 86 Anti-Air, Rorsch Kz-27, and the gunner seat on battlewalkers) require weapon lock for homing. These same systems can also be dumb-fired.


Vehicles can detect the rangefinders used by Engineers for their default AV launcher and the SAAW, and by enemy vehicles for their main weapons (tank main cannon, rocket pods, emplacements).

The lock alarm does not actually warn against the projectiles used, but rather that an enemy is aiming an AV weapon towards it. There is also no indication of where the offending launcher is located. Anti-vehicle infantry can thus spoof vehicle operators by merely aiming at them (even with empty AV weapons), causing them to waste countermeasures or even leave the area to avoid conflict. Skillful users can also aim off-axis until their munitions are close to the target, or fire unguided to prematurely end the alarm.

Battlefield: Bad Company 2[]

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The Tracer Dart Gun allows certain weapons to acquire weapon lock. Available targets are marked with a red "four corners" icon. When fully locked, a red square icon (surrounding the corners icon) and range to target appears underneath. The square flashes while lock is being acquired.

Battlefield 3[]


Players can make use of heat-seeking weaponry such as AA missiles, the FGM-148 Javelin, and vehicle-mounted guided missiles. They can also use laser designators to mark targets for laser-guided weaponry—the weapon carrier must acquire a separate lock while the designator himself is locked onto the target vehicle. A rising chirp signifies active seeking, with a steady high tone indicating lock.

A red square icon indicates a successful weapon lock. A red lozenge with dot indicates a laser lock when teammates are carrying guided weaponry.


Vehicles can detect both locking systems, identifying it as a low beeping tone that goes solid when fully locked. They can also detect incoming missiles, identified as a level high beeping tone. This allows the operator to use countermeasures such as IR Smoke or flares, or to break the lock using ECM Jammer. A skilled operator can also make use of overhead cover against top-attacking laser ordnance, or lateral cover against heat-seeking weapons.

Equipment and gadgets that can provide laser designation are visible to the target as a red laser (similar to the Laser Sight).

Wire-guided weapons such as the BGM-71 TOW, 9M133 Kornet, or an attack helicopter's TV missile do not trigger an alarm, as they do not rely on weapon lock. However, wire-guided weapons do not travel as fast as other guided weapons.

Battlefield 4[]


A redesigned lock icon informs the player how well the lock process is proceeding. A thin square icon marks valid targets. Four corners gradually converge into a crosshair, with an additional "Fire" prompt indicating lock.

If the weapon system requires constant lock, such as on the SA-18 IGLA and HVM-II, a "Hold" prompt appears near the icon for the weapon user. The FIM-92 Stinger does not require constant line-of-sight lock.

As in Battlefield 3, a red diamond and dot icon appears when a laser lock is provided.


The early warning system is improved with the addition of a white, directional "threat marker" that resembles the red marker used when taking damage. This allows the vehicle to better respond to the threat. The same sounds are carried over from Battlefield 3.

Laser Designation will also be detected as weapon lock by a vehicle.

Battlefield 2042[]


An animated lock sequence (reminiscent of Battlefield 4) is used for lock-on weaponry in Battlefield 2042.

Certain drones are capable of automatically engaging enemy targets. This includes the Ranger call-in, anti-armor Smart Explosives, and the SG-36 Sentry System.


All vehicles warn against SOFLAM locks, hacking underway, anti-vehicle missiles, and anti-armor smart explosives.