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Ballistic Vests (previously Kevlar Vests) are a 600-point Support Action.
They, unlike previous Defensive Support Actions, boost the player's health, instead of giving the player an edge such as damage boosts or intel. They give the player 100 extra points of health. It also grants the player 100 points for their score chain.
Calling in a Ballistic Vest will grant the player double the score they would normally get for reaching the Level 7 Score Chain. Getting killed removes this bonus.