Forward Operating Site

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." These sites were established as the Pentagon began to address regional threats primarily in Africa and Latin America following its 2004 global posture review.

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.

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

Asia

 * Paya Lebar Airfield, Singapore

Latin America

 * Curaçao International Airport, CW, Kingdom of the Netherlands
 * Queen Beatrix International Airport, AW, Kingdom of the Netherlands
 * Soto Cano AB, Honduras

Europe

 * RAF Fairford, United Kingdom
 * Bulgaria (see List of joint US-Bulgarian military bases)
 * Romania

Africa

 * Camp Lemonnier, Djibouti
 * Morocco
 * Tunisia