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
Badges of the United States Marine Corps to describe "identification badges" and "marksmanship badges", and the term "insignia" shall be used for other worn accoutrements, according to the language in Marine Corps Uniform Regulations. The modern-day United States Marine Corps currently maintains the following breast insignia and identification badges: As per Marine Corps Assignment, Classification and Travel Systems Manual (ACTS MANUAL) MCO P1000.6, Marines wear the appropriate breast insignia for qualification or designation in aviation, parachutist, explosive ordnance disposal, and diving. Authorized breast insignia are worn on the left breast of all service and dress coats. They may optionally be worn on khaki shirts when the shirt