Forward Operating Site

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A Forward Operating Site (FOS) or Forward Operating Location (FOL) is a U.S. military term for facilities, defined as "a scalable, 'warm' facility that can support sustained operations, but with only a small permanent presence of support or contractor personnel. A FOS will host occasional rotational forces and many contain pre-positioned equipment."[1] These sites were established as the Pentagon began to address regional threats primarily in Africa and Latin America following its 2004 global posture review.[2]

An FOS is differentiated from a Cooperative Security Location (CSL) with no permanent force or contractor personnel, or a Main Operating Base (MOB), with a large force and a well-defended site.


They include, but are not limited to the following locations:


Latin America[edit]



See also[edit]