Since players have to manage a high amount of soldiers and missions, the ability to create persistent squads by assigning soldiers in the Squad Management interface exists to streamline soldier selection by loading up a squad from the list, and then making ad hoc changes if necessary. To compensate, there is no fatigue mechanic, allowing soldiers that just completed a mission without suffering wounds to go on another one. Taking too many soldiers increases the time to fully infiltrate, in turn increasing the time those soldiers are unavailable. However taking as many soldiers as possible on every mission is not advisable due to the new Infiltration mechanics, which make it so the squads sent on a mission have to wait to build up infiltration to carry out the mission without it being excessively difficult.
On missions involving Havens your squad will be reinforced by the Advisor assigned to them and in some occasions a few rebels. Network Tower Assaults have a maximum of 5 soldiers. Players can send up to 8 soldiers on most missions, and up to 10 or 12 on special missions. Unlike in Long War or vanilla XCOM 2, the maximum squad size remains fixed for the entire campaign.