The [Department of State] special agents, also called regional security officers (RSOs) when serving abroad, manage security programs and also provide the first line of defense for our personnel, their families, U.S. diplomatic missions, and national security information...
Often, in times of crisis and political instability, RSOs rely on the U.S. military for assistance. Unified commands have the capability to supply post with combat-equipped troops, e.g., Fleet Anti-Terrorism Security Teams (FAST), to augment post security requirements...
In addition to [Security Engineering Officers], RSOs depend upon Marine Security Guards, U.S. Navy Seabees, surveillance detection teams, local guards, cleared American guards, local investigators, host government officials, and other DS elements... These entities play a crucial role in the DS security efforts overseas.
At our highest threat posts, RSOs may often require further security assistance. In those instances, DS dispatches Mobile Security Teams from Washington to conduct training for embassy personnel... These teams also provide emergency security support to overseas posts, including protective security for COMs, surveillance detection operations, and assistance with post evacuations. In cases where the host country is either unable or unwilling to provide necessary security for the conduct of American diplomacy, specially trained DS special agents lead contractor-provided personal protection teams and guard services in areas of ongoing conflict.