Priests who wish join the Chaplain Services of the Armed Forces, the National Police, and the Coast Guard are required to fulfil the standard requirements of both the service branch they are entering and the Church. The endorsement of the Military Ordinary is amongst the most important of the ecclesiastical requirements; the Ordinary submits the names of applicants for a "call to active duty" (CAD). He gives to Chaplains and civilian priests working for the services the canonical faculties to exercise their spiritual ministry among subjects of the Military Ordinariate.