The Designated Official has authority, in emergency situations, such as CASEVAC, evacuation and relocation for security purposes, to approve the use of any commercial air operator or commercially operated donated flight in the interest of ensuring UN personnel safety and security. Whenever practicable, such approval should be taken in consultation with the Heads of UNSMS entities or their designate(s). In emergency situations, the DO may also contact CATSU directly when urgent information is needed.