United States military chaplains hold positions in the armed forces of the United States and are charged with conducting religious services and providing counseling for their adherents. As of 2011, there are about 2,900 chaplains in the Army, among the active duty, reserve, and National Guard components.
Within the United States Department of Defense, the Armed Forces Chaplains Board (AFCB) advises the Secretary of Defense and the Under Secretary of Defense for Personnel and Readiness on religious, ethical, and moral matters, as well as policy issues affecting religious ministry and the free exercise of religion within the military services. The three Chiefs of Chaplains and three active-duty Deputy Chiefs of Chaplains of the Army, Navy, and Air Force are its members.
A military chaplain must be endorsed by a religious organization in order to serve on active duty. In the contemporary U.S. military, endorsement is a complex area and many different paths are available. This religious endorsement must be maintained throughout the chaplain's military service and can be withdrawn at any time for religious or disciplinary reasons by the religious body with which the chaplain is affiliated, though provisions exist for exceptional cases. A military chaplain's rank is based on years of service and promotion selection from the appropriate peer group. Each is identified in uniform both by rank and religious affiliation insignia that indicate as well the branch of service.
Chaplains have served in the various branches of the United States armed forces since their formation, including in the Continental Army during the American Revolution. Congress authorized the hiring of an Army chaplain in 1791.
General Carl Spaatz, the first Air Force Chief of Staff, ordered the institution of a separate Air Force chaplaincy on May 10, 1948.
The U.S. Marine Corps and the U.S. Coast Guard do not have their own chaplaincies, but are served by the Navy Chaplain Corps.
In 1999, Rabbi Arnold E. Resnicoff, a US chaplain, proposed widening the chaplain's role to include that of engagement with local religious leaders in conflict zones to improve the military's understanding of local religious issues and include chaplains in the conflict prevention and reconciliation processes. This outreach is part of the duties listed for chaplains in Joint Publication 1-05 on chaplain operations.