Modern day armored vests were originally known as "flak jackets", and were used by bomber crews to protect against high-caliber proximity-detonated anti-aircraft shells (flak). After research during the Vietnam war showed that 2/3 of casualties were from fragmentation, not bullets, body armor saw a proper return to the frontlines.
|AMMO ← → EXPL|
Reduces explosive damage caused upon the player and his squadmates
Level 8 (Solo)
— Battlelog description
The solo specialization is unlocked at rank 8, while the squad specialization is unlocked at rank 29.
FLAK is a specialization featured in Battlefield 4. It decreases damage from explosions by 15%. It is a part of numerous Upgrade Paths. As in Battlefield 3, the specialization does not protect against direct hits from explosives.
- Defensive - Third Specialization
- Grenadier - Fourth Specialization
- Mechanic - Second Specialization
- Anti-Tank - Fourth Specialization
— In-Game Description