The Sacrament of Holy Orders

Holy Orders is the sacrament through which the mission entrusted by Christ to his apostles continues to be exercised in the Church until the end of time: thus it is the sacrament of apostolic ministry. It includes three degrees: episcopate, presbyterate, and diaconate.  [Bishop, Priest, Deacon]
Catechism of the Catholic Church 1536

Information on Priestly Vocations with the Diocese of Grand Rapids can be found here.