Culture of the United States Marine Corps
Two styles of swords are worn by Marines. The Marine Corps officers' sword is a Mameluke Sword, similar to the Persian shamshir presented to Lt. Presley O'Bannon after the Battle of Derna during the First Barbary War. After its adoption in 1825 and initial distribution in 1826, Mameluke Swords have been worn by Marine officers ever since, except during the period 1859–1875, when they were required to wear the Army's Model 1850-foot officers' sword. Upon returning to the traditional sword, many officers gave their Army swords to their senior noncommissioned officer, creating the basis for the NCO sword. Generally, Marines are the only branch where enlisted members regularly carry a sword (the Army authorizes platoon and first sergeants to carry a Model 1840 sword during some ceremonies, while the Chief of Naval Operations authorized Chief Petty Officers and above to carry an optional ceremonial cutlass with dress uniforms in 2010).
Meritorious Service Medal (United States)
The U.S. Navy, U.S. Marine Corps, and U.S. Coast Guard ascribe to a slightly different philosophy from the Army and the Air Force in awarding the MSM, typically reserving it for senior Navy and Coast Guard officers in pay grades O-5 and O-6 (commander and captain) and Marine Corps field grade officers in pay grades O-5 and O-6 (lieutenant colonel and colonel), with the first award of the MSM typically occurring after completion of a successful commanding officer assignment at the O-5 level. Award of the MSM to USN, USMC, and USCG officers in pay grade O-4 (USN & USCG lieutenant commander / USMC major) and below, to include chief warrant officers and below (other than as an award at retirement to CWO5 and CWO4) is typically by exception and normally limited to those who have held one of the service's handful of O-4–level commanding officer assignments (e.g., Avenger-class mine countermeasures ship) or serving on a USN or USCG flag officer staff or USMC general officer staff.