text: Glossary
  *relative advantage
  A location or condition, in any domain, relative to an adversary or enemy that provides an opportunity
  to progress towards or achieve an objective.
  relief in place
  An operation in which, by direction of higher authority, all or part of a unit is replaced in an area by
  the incoming unit and the responsibilities of the replaced elements for the mission and the assigned
  zone of operations are transferred to the incoming unit. (JP 3-07.3)
  reserve
  That portion of a body of troops that is withheld from action at the beginning of an engagement to be
  available for a decisive movement. (ADP 3-90)
  retrograde
  (Army) A type of defensive operation that involves organized movement away from the enemy.
  (ADP 3-90)
  route reconnaissance
  A type of reconnaissance operation to obtain detailed information of a specified route and all terrain
  from which the enemy could influence movement along that route. (ADP 3-90)
  screen
  A type of security operation that primarily provides early warning to the protected force. (ADP 3-90)
  seabasing
  The deployment, assembly, command, projection, reconstitution, sustainment, and re-employment of
  joint power from the sea without reliance on land bases within the operational area. (JP 3-02)
  *sector
  An operational area assigned to a unit in the defense that has rear and lateral boundaries and
  interlocking fires.
  security cooperation
  All Department of Defense interactions with foreign security establishments to build security
  relationships that promote specific United States security interests, develop allied and partner nation
  military and security capabilities for self-defense and multinational operations, and provide United
  States forces with peacetime and contingency access to allied and partner nations. (JP 3-20)
  security force assistance
  The Department of Defense activities that support the development of the capacity and capability of
  foreign security forces and their supporting institutions. (JP 3-20)
  security forces
  Duly constituted military, paramilitary, police, and constabulary forces of a state. (JP 3-22)
  security operations
  Those operations performed by commanders to provide early and accurate warning of enemy
  operations, to provide the force being protected with time and maneuver space within which to react to
  the enemy, and to develop the situation to allow commanders to effectively use their protected forces.
  (ADP 3-90)
  security sector reform
  A comprehensive set of programs and activities undertaken by a host nation to improve the way it
  provides safety, security, and justice. (JP 3-07)
  *setting the theater
  The broad range of activities continuously conducted to establish conditions for the successful
  execution of operations in a theater.