In making any authorized disbursement from the National Service Trust in regard to an eligible individual (including disbursement for a designated individual, as defined in section 12604(f)(8) of this title, due to the service of an eligible individual) under section 12602 of this title who served in an approved national service position, an approved summer of service position, or an approved silver scholar position, the Corporation shall rely on a certification. The certification shall be made by the entity that selected the individual for and supervised the individual in the approved national service position in which such individual successfully completed a required term of service, in a national service program.