Since 1949, Marine Security Guard detachments at U.S. diplomatic posts abroad have worked closely with the U.S. Department of State’s Bureau of Diplomatic Security to protect and safeguard American diplomacy.

Marine Security Guards (MSGs) stand duty 24 hours each day, seven days a week, at U.S. embassies and consulates worldwide. They staff the all-important Post One communications center at our embassies, thereby ensuring vital emergency communications are properly routed during times of emergency or heightened alert.


MSGs protect classified information and equipment from unauthorized disclosure, and provide internal security protection for U.S. citizens and U.S. Government property under a range of circumstances, up to and including hostile assaults.


The courage and support of the MSGs has been constant in every situation.



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