Zero Company call for backup explained

In a three-AP turn, an action that costs nothing is structurally important. Call for Backup lets an Operator contribute to an attack without giving up their own turn, which is how a squad gets more done than twelve Action Points should allow.

The assisting Operator fires their own shot at whatever you attack, which means they need line of sight to it. A previewer describes the targeting interface naming which squadmate will assist, and reporting 'no line of sight' when the pairing cannot fire.

This turns a free action into a positioning constraint. The two ends of a backup pairing have to share sightlines on the same enemies, which pulls against the usual instinct to park a long-range Operator somewhere isolated and safe. A Sharpshooter on a distant roof is a poor backup partner for anyone working a doorway.

The same previewer reports that the nominated assistant rotates between squad members each turn rather than staying fixed, so you cannot simply designate one pairing and forget it.

Using Call for Backup helps build Bonds, and Bonds unlock permanent combat bonuses and are a main source of Focus Points. So the free action is not only a per-turn benefit — it is progression.

That makes support-action frequency a genuine squad-building dimension: a squad that naturally uses Call for Backup often will develop its Bonds faster than one that does not.