FORWARD OPERATING SITE

A scaleable location outside the United States and US territories intended for rotational use by operating forces. Such expandable “warm facilities” may be maintained with a limited US military support presence and possibly pre-positioned equipment. Forward operating sites support rotational rather than permanently stationed forces and are a focus for bilateral and regional training. Also called FOS. See also cooperative security location; main operating base. (CJCS CM-0007-05)