text: Sustainment
  (cid:122) Known or likely locations of enemy penetrations, attacks, CBRN attacks, or obstacles.
  (cid:122) Known or potential civilian and dislocated civilian movements that must be controlled or
  monitored.
  9-191. Security of supply routes in noncontiguous area of operations may require the BCT commander to
  commit combat units. The security and protection of supply routes along with lines of communications are
  critical to military operations since most support traffic moves along these routes. The security of supply
  routes presents one of the greatest security challenges in an area of operations. Route security operations are
  defensive in nature and are terrain oriented. A route security force may prevent an enemy or adversary force
  from impeding, harassing, or destroying traffic along a route or portions of a route by establishing a
  movement corridor. Units conduct synchronized operations (mobility and information collection) within the
  movement corridor. A movement corridor may be established in a high-risk area to facilitate the movement
  of a single element, or it may be an enduring operation. (See FM 3-90-2 for additional information.)
  9-192. A convoy security operation is a specialized kind of area security operation conducted to protect
  convoys. Units conduct convoy security operations anytime there are insufficient friendly forces to secure
  routes continuously in an area of operations and there is a significant danger of enemy or adversary ground
  action directed against the convoy. The commander may conduct convoy security operations in conjunction
  with route security operations. Planning includes designating units for convoy security; providing guidance
  on tactics, techniques, and procedures for units to provide for their own security during convoys; or
  establishing protection and security requirements for convoys carrying critical assets. Local or theater policy
  typically dictates when or which convoys receive security and protection. (See ATP 4-01.45for additional
  information.)