Flak vests are a 175-point defensive Support Action. It is paired with the Missile Attack offensive support action. This Defensive Support Action raises the health of the player and their teammates. This Support Action, along with Ballistic Vests, does stack, and with both in conjunction, many firefights by the player will be won. Using this Support Action will grant the player a 30 point boost, and players HUD triangles will glow blue, along with other Defensive Support Actions that effect the player's team.