Upon the trial of an issue arising upon a prayer for the appointment of either a temporary or a permanent conservator, a certificate of the secretary of the United States department of veterans affairs, or the secretary’s representative, setting forth the fact that the defendant veteran has been rated incompetent by the United States department of veterans affairs upon examination in accordance with the laws and regulations governing the United States department of veterans affairs, shall be prima facie evidence of the necessity for such appointment, and the court may appoint a conservator for the property of such person.