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The “Call Medic” sound tells the enemy you’re alive and that a medic may be coming.
Spread out so one grenade or burst can’t take out several players, and keep the medics in the middle.
Hit the engine or tracks, then call a HAT or friendly vehicle: a tank’s turret is not a weak spot.
The third pillar: keep the rally rearmed, keep your ammo bag full and farm kills.
Keep the squad in the fight and run the tactical side of every firefight.