Each Unit in a squad has a minimum of two turns, after their turn it either switches to the next unit of your squad or an enemy Bug or cutscene. Turns of an individual unit depend usually upon how many hexagons one is attempting to move across. When moving too far, a player uses all two turns for one specific unit.
Each squad has a minimum of one unit for a single level in Mech Mice Tactics. Any Unit is able to be used for a Mission as long as the player has unlocked that Unit.