The Reverend Charles Johnson, Navy chaplain, celebrates the liturgy of the Feast of Saint John the Apostle aboard the aircraft carrier
USS THEODORE ROOSEVELT (CVN 71). Note the Gesu Bambino placed near the altar crucifix.
A statue of Our Lady is placed to the left of the altar for the celebration of Holy Mass. A US Navy Sailor serves as acolyte.
Information about the provenance and make of Father Johnson's Roman vestments is available
here.
Larger Navy ships such as aircraft carriers usually have a dedicated chapel space which must be maintained as a "neutral", or non-denominational, space when not in use by a particular religious group in order to better facilitate the beliefs of all. The materials necessary for the celebration of the liturgy are stored away to be set up for each Holy Mass and then taken down again afterward.