text: Glossary
  reconnaissance in force
  A form of reconnaissance operation designed to discover or test the enemy’s strength, dispositions, and
  reactions or to obtain other information. (FM 3-90)
  reconnaissance-pull
  Reconnaissance that determines which routes are suitable for maneuver, where the enemy is strong and
  weak, and where gaps exist, thus pulling the main body toward and along the path of least resistance.
  (FM 3-90)
  reconnaissance-push
  Reconnaissance that refines the common operational picture, enabling the commander to finalize the
  plan and support main and supporting efforts. (FM 3-90)
  redeployment
  (Army) The transfer of forces and materiel to home and/or demobilization stations for reintegration or
  out-processing. (ATP 3-35)
  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. (FM 3-0)
  reserve
  (Army) 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)
  retirement
  When a force out of contact moves away from the enemy. (ADP 3-90)
  retrograde
  (Army) A type of defensive operation that involves organized movement away from the enemy.
  (ADP 3-90)
  risk management
  The process to identify, assess, and mitigate risks and make decisions that balance risk cost with
  mission benefits. (JP 3-0)
  route reconnaissance
  A form of reconnaissance operation to obtain detailed information of a specified route and all terrain
  from which the enemy could influence movement along that route. (FM 3-90)
  scientific and technical intelligence
  Foundational all-source intelligence that covers: a. foreign developments in basic and applied research
  and applied engineering techniques and b. scientific and technical characteristics, capabilities, and
  limitations of all foreign military systems, weapons, weapon systems, and materiel; the research and
  development related thereto; and the production methods employed for their manufacture. (JP 2-0)
  screen
  A type of security operation that primarily provides early warning to the protected force. (ADP 3-90)
  sector
  An operational area assigned to a unit in the defense that has read and lateral boundaries and
  interlocking fires. (FM 3-0)
  security operations
  Those operations performed by commanders to provide early and accurate warning of enemy
  operations, to provide the forces 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)
  signals intelligence
  Intelligence derived from communications, electronic, and foreign instrumentation signals. (JP 2-0)