I have checked ITR 2nd Ed. HBR. There is nothing forbidding crews to voluntarily Abandon vehicles in there or vehicular crews to gain Building Control.
So you would have to refer to the SBR of the individual scenario of that pack for such rulings.
ITR-4, ITR-5, ITR-10, ITR-11, ITR-15, ITR-19, and ITR-20 forbid crews to voluntary Abandon (D5.4) an AFV. No SBR forbids vehicular crews to gain Building Control in any scenario.
von Marwitz