What is a person called who is chosen to conduct religious exercises for the military?

The term for a person chosen to conduct religious exercises for the military is "Chaplain." This role is significant within military organizations, as chaplains provide spiritual support, conduct services, and offer counseling to military personnel and their families. They may come from various religious traditions and are trained to address the unique spiritual and emotional needs of service members, especially during times of conflict or crisis.

The other options have distinct meanings that do not apply to the context of military religious support. A celebrant generally refers to an individual who performs a specific religious ceremony, such as a wedding or baptism, but does not indicate a military role. A common carrier relates to transportation and logistics, playing no part in religious exercises. A columbarium is a structure for housing urns containing ashes of the deceased, thus having no relevance to military chaplaincy. Understanding these definitions clarifies why "Chaplain" is the correct answer in this context.