The FGM-148 Javelin is an American-made, man-portable third generation Anti-Tank Guided Missile (ATGM) launcher manufactured by Raytheon and Lockheed Martin.
The Javelin was designed to replace the aging M47 Dragon anti-tank missile, previously used by the United States during 1975 - 1995.
In real life, the Javelin's missile is capable of penetrating a main battle tank's base and explosive reactive armor. It does this by utilizing two shaped-charge warheads in tandem. The smaller warhead detonates the explosive reactive armor allowing the larger warhead to penetrate the tank's base armor.
The FGM-148 Javelin makes its debut appearance on Battlefield 3.
The FGM-148 Javelin is only available during the Single Player campaign mission Operation Guillotine, where it is first used by a USMC anti-armor team to destroy a T-90 that had Blackburn's squad pinned down; it is later used by Blackburn to destroy the remaining enemy tanks assaulting the bank.
The FGM-148 Javelin appears in the mission Operation Exodus where it is the secondary weapon of both players. It is used to destroy the incoming enemy armored personnel carriers, alternatively, the players could place M15 AT Mines immediately at the start of the mission where the enemy APC's will drive over and detonate the mines.
It takes up to three hits from the Javelin to destroy an enemy BMP-2 when attacking its frontal armor; two hits will disable the APC.
Ammunition for all weapons, including the Javelin can be replenished at a nearby ammo crate.
The FGM-148 Javelin is the last unlockable anti-vehicle weapon for the Engineer kit, requiring 82,000 points to unlock. It is capable of locking on to any ground vehicle within line-of-sight and within range. It can also receive targets via laser designation, allowing it to attack air vehicles. The Javelin's targeting ability can be hindered by Thermal Camouflage or Stealth, and defeated by IR Smoke or IR Flares. It must also be noted that the Javelin is completely incapable of firing it's payload without being locked on to a target, and as such is borderline completely useless against infantry, unless they get caught in the blast near a locked-on target.
By default, the Javelin uses 'Direct Attack' mode, which attacks vehicles directly, generally hitting their front, side or rear armor. When attacking a laser-designated target, the Javelin automatically switches to 'Top Attack' mode, doing up to twice the damage by launching the missile high into the air and then hitting the vehicle from the top almost always gaining a disable or kill on the targeted vehicle. It must noted that in "Direct Attack" mode, the Javelin will indiscriminately track it's target directly, and make no effort to avoid either terrain or other objects, making it somewhat difficult to use on armored targets in forests, or mountainous areas.
Up to mid-range, the Javelin could be previously forced to attack from a higher angle without laser designation by quickly aiming high just before launching the weapon (and losing weapon lock). The initial booster helped lob the missile high into the air, helping it strike from a higher angle even though it is still in "Direct Attack" mode. As of the latest patch this tactic does not longer work but instead causes the missile to do a loop backwards and then continue to its target as normal. This tactic can still be used to "bank" the missile around corners but not above obstacles as before.
The Javelin can detect and attack certain deployable devices using direct attack mode:
The FGM-148 Javelin is featured in Battlefield 4.
It does the highest base damage of any rocket launcher (30% against heavy vehicles), but unlike rocket launchers such as the RPG-7V2 and FGM-172 SRAW, it cannot inflict extra damage by aiming for weak points.
It acquires targets very quickly, but requires that the user maintain weapon lock throughout the flight of the missile, much like the SA-18 Igla against air vehicles, and unlike other guided weapons seen in the Battlefield series. If the missile loses its lock mid-flight it will continue to travel forward (along the same trajectory) as if it were an unguided rocket. The missile however can re-engage a target if the user locks onto another target before it self-detonates.
Like the MBT-LAW and SRAW, it can lock onto laser-painted targets (including air vehicles) and inflict more damage. In this case, the player does not need to maintain lock after firing. A laser-designated hit will do 50% against heavy vehicles, and 90% against helicopters and armored cars.