A Church Pennant is a pennant flown to indicate that a religious service is in progress. It is flown on ships and establishments (bases).The United States Navy maintains several church pennants, of which the appropriate one is flown immediately above the ensign wherever the ensign is displayed, at the gaff when under way, or at the flagstaff when not under way, when religious services are held aboard ship by a Navy chaplain. Originally, the only authorized church pennant was for Christian chaplains, regardless of specific denomination. Later in 1975, the Secretary of Navy approved a similar Jewish worship pennant.