text: Chapter 5
  units establish perimeters around base camps, critical infrastructure, and high-value assets, while other units
  conduct operations to establish presence, provide security, and assist in stability or relief tasks. The
  commander positions reaction forces or disperses the reserve between several secured perimeters. Other
  missions or tasks that support area security may include the following:
  * Route or convoy security of critical lines of communications.
  * Checkpoint operations to monitor or control movement.
  * Patrols to cover gaps between secured perimeters.
  * Maintain an observable presence.
  ROUTE SECURITY
  5-130. Cavalry units conduct route security missions to prevent enemy forces from affecting freedom of
  maneuver along a protected route. A route security force operates on and to the flanks of a designated route.
  Route security operations are defensive in nature, and unlike guard operations, are terrain-oriented. A route
  security force prevents an enemy force from impeding, harassing, containing, seizing, or destroying traffic
  along the route. To accomplish this task, the force performs the following functions:
  * Conduct continuous mounted and dismounted reconnaissance of the route and key locations along
  the route to ensure trafficability.
  * Conduct sweeps of the route at irregular intervals to prevent emplacement of enemy mines.
  * Cordon sections of the route to search suspected enemy locations.
  * Establish roadblocks and checkpoints along the route and lateral routes to stop and search vehicles,
  persons, and those entering the route.
  * Occupy key locations and terrain along or near the route. If possible, establish a screen oriented
  to prevent enemy direct fire weapons and observation from influencing the route. This function is
  known as out posting, also.
  * Aggressively conduct ground and aerial patrols to maintain route security.
  * Establish observation posts (covert and overt) or ambushes at critical points to watch for threat activity.
  CONVOY SECURITY
  5-131. Convoy security is a subset of area security. Convoy security missions are offensive in nature and
  orient on the protected force. Typically, a convoy security is a security mission assigned to Cavalry troops,
  maneuver companies, and maneuver platoons. Commanders order convoy security missions when
  insufficient friendly forces are available to secure lines of communication in an area of operations. The
  commander may order troops to conduct convoy security missions in conjunction with route security
  operations. A convoy security force operates to the front, flanks, and rear of a convoy element moving along
  a designated route or integrated into the body of the convoy.
  5-132. A convoy security mission has specific tasks that guide planning and execution. The security force
  accomplishes the following to protect a convoy:
  * Reconnoiter the route the convoy is to travel.
  * Clear the route of obstacles or positions from which the enemy could influence movement.
  * Provide early warning of enemy presence along the route.
  * Prevent the enemy from impeding, harassing, containing, seizing, or destroying the convoy.
  Organization
  5-133. If possible, the convoy security force is a combined arms organization with integrated air and ground
  assets (see figure 5-17). Ideally, a convoy security force has sufficient combat power to organize into the
  following elements:
  * Advance guard. The advance guard performs continuous reconnaissance tasks along the main
  body’s axis of advance or route. The advance guard maintains continuous surveillance of enemy
  avenues of approach and destroys or repels enemy reconnaissance and security forces to protect
  the convoy.
  * Security element. The security element provides early warning and security to the convoy’s flanks
  and rear. They may perform duties of the escort element.