United States Marine Corps off-base, except in transit to and from their place of duty and in the event of an emergency. As in any military organization, the official and unofficial traditions of the Marine Corps serve to reinforce camaraderie and set the service apart from others. The Corps' embrace of its rich culture and history is cited as a reason for its high "esprit de corps". The "Marines' Hymn" dates back to the 19th century and is the oldest official song in the United States armed forces. The Marine motto "Semper Fidelis" means "Always Faithful" in Latin, often appearing as "Semper Fi"; also
Assistant Commandant of the Marine Corps the Navy – may delegate to or prescribe for him. Orders issued by the Assistant Commandant in performing such duties have the same effect as those issued by the Commandant. When there is a vacancy in the office of Commandant of the Marine Corps, or during the absence or disability of the Commandant, the Assistant Commandant shall perform the duties of the Commandant until a successor is appointed or the absence or disability ceases. ! # ! class="unsortable"|Photo ! Rank ! Name ! Tenure from ! Tenure to ! Became Commandant Assistant Commandant of the Marine Corps The Assistant Commandant