It supplies the player with 75 units of armor with a maximum of 100 units. Normally the armor takes 2/3 of the damage; both the flak jacket and the helmet add to the same armor pool (maximum of 100), that protects against shots to both head and body.
- Mission 2 Part 1 - Given by Karl Villigut along with a Sten.
- Mission 3 Part 2 - Shortly after entering the base, in the aid station guarded by 2 guards.
- Mission 6 Part 3 - Before fighting against the Super Soldier, at the start of the level.
- The armor can be stacked for effect. You could use 2 flak jackets to gain the max 100 units of armor.