Sec. 13. The unit may approve or fund a land use activity after a determination under section 12 of this chapter that the activity adversely affects the installation's military operations if the unit:
(1) mitigates the adverse impact of the land use activity in the manner agreed upon by the unit and the commander; or
(2) agrees to complete the mitigation agreed upon by the unit and the commander before commencing construction, issuing improvement location permits, entering into contracts, or commencing any other substantial step toward initiation of the land use activity.