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History of Marine Security Guard Battalion

The Marine Security Guard Battalion (MSG BN), established in 1948, is a specialized unit of the United States Marine Corps tasked with providing security at U.S. embassies, consulates, and diplomatic missions worldwide. Its formation followed a series of security incidents at U.S. diplomatic posts, prompting the Department of State and the Marine Corps to formalize the assignment of Marines to protect American personnel and classified information abroad. Over the decades, MSGs have played critical roles in crisis situations, such as evacuations and attacks on embassies, including the 1979 Tehran embassy crisis. Today, the battalion remains a vital component of U.S. diplomatic security, with Marines serving at over 150 posts in more than 130 countries.

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ABOUT Marine Security Guard Battalion

  • Origins in 1948: The Marine Security Guard Battalion (MSG Bn) was formally established in 1948, following a request from the U.S. State Department for Marines to protect American embassies and consulates worldwide.
  • Global Presence: MSG Bn maintains detachments at over 150 U.S. diplomatic posts in more than 135 countries, making it one of the most globally dispersed Marine units.
  • Call Sign "Watchstanders": Marines in the MSG Bn are often referred to as "Watchstanders," reflecting their 24/7 duties guarding American diplomatic missions.
  • Rigorous Selection and Training: Marines must complete a competitive selection process and a seven-week school at Marine Corps Base Quantico, Virginia, before joining the MSG Bn.
  • Notable Action in Tehran: During the 1979 Iran hostage crisis, MSG Marines attempted to defend the U.S. Embassy in Tehran, with several taken hostage and later released after 444 days.
  • Women in the Ranks: In 1997, the first female Marines graduated from the MSG School and began serving in the battalion, breaking a longstanding gender barrier.
  • Special Ceremonial Uniform: MSG Marines are often recognized for their distinctive dress blue uniforms, which are worn during official functions and ceremonies at embassies.
  • Silver Trident: Upon graduation, MSGs are awarded the Marine Security Guard badge, often called the "Silver Trident," symbolizing their elite status.
  • Fallen Heroes: The battalion has suffered losses, including during the 1983 U.S. Embassy bombing in Beirut, where eight MSG Marines were killed in the line of duty.
  • Annual MSG Ball: Many embassies and consulates host an annual Marine Corps Birthday Ball, where Marines and embassy staff celebrate the history and camaraderie of the MSG mission.

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