The bearer's unit may start the game in Tunnel Reserve. Ambush rolls of the bearer's unit may be rerolled. This overrides the restriction of Special Items not working while their bearer is off the board. If the unit passes an Ambush roll, all subsequent failed Ambush rolls for Tunnel Reserve during this Player Turn may be rerolled. Any unit that passes its Ambush roll due to this reroll must enter the Battlefield from the same Tunnel Marker as the bearer's unit. If this is not possible, the unit cannot enter the Battlefield during this Player Turn. Roll again in the next friendly Player Turn.