C.R.S. § 14-13.7-305

(1) In a proceeding for a grant of custodial responsibility pursuant to this part 3, the following rules apply: (a) A prior judicial order designating custodial responsibility in the event of deployment is binding on the court unless the circumstances meet the requirements of law of this state other than this article for modifying a judicial order regarding custodial responsibility; (b) The court shall enforce a prior written agreement between the parents for designating custodial responsibility in the event of deployment, including an agreement executed under part 2 of this article, unless the court finds that the agreement is not in the best interest of the child.