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McMahon and Judge were members of the Marine Security Guard (MSG) Battalion at the US Embassy, Saigon and were providing security for the DAO Compound, adjacent to Tân Sơn Nhứt Airport, Saigon.
From January 28, 1930 until March 13, 1932, Breckinridge commanded the Marine Detachment at the American Legation, Peiping, China, and was promoted to brigadier general on October 31, 1931.
Under the RSO's direct supervision are the following groups: U.S. Marine Security Guards, Assistant RSOs, local guards, foreign service national (FSN) investigators, an office management specialist and other secretarial and staff assistants, a Surveillance Detection Unit (with a mission of detecting hostile surveillance), security engineering officers, security technical specialists, as well as Navy Seabees assigned to post.
Sergeant Steven J. Crowley (March 27, 1959 – November 21, 1979) was a Marine Security Guard killed during the 1979 U.S. embassy burning in Islamabad.
Over the years, there were some prominent inmates at the Brig, including John Hinckley, Jr., a would-be presidential assassin, Clayton J. Lonetree, the Marine Security Guard who provided classified information to the KGB while stationed at the U.S. Embassy, Moscow from 1984 to 1986, and Rayful Edmond, largely credited with introducing crack cocaine into the Washington, D.C., area.