text: Chapter 1
  retained personnel — (DOD) Detainees who fall into one of the following categories: a. Designated enemy
  medical personnel and medical staff administrators who are exclusively engaged in either the search for,
  collection, transport, or treatment of the wounded or sick, or the prevention of disease; b. Staff of National Red
  Cross and Red Crescent Societies and that of other volunteer aid societies, duly recognized and authorized by
  their governments to assist medical service personnel of their own armed forces, provided they are exclusively
  engaged in the search for, or the collection, transport or treatment of wounded or sick, or in the prevention of
  disease, and provided that the staff of such societies are subject to military laws and regulations; c. Chaplains
  attached to enemy armed forces. (JP 3-31) Also called RP.
  retirement — When a force out of contact moves away from the enemy. (ADP 3-90)
  retrograde — (DOD) The process for the movement of non-unit equipment and materiel from a forward location
  to a reset (replenishment, repair, or recapitalization) program or to another directed area of operations to
  replenish unit stocks, or to satisfy stock requirements. (JP 4-09) (Army) A type of defensive operation that
  involves organized movement away from the enemy. (ADP 3-90)
  retrograde movement — Any movement to the rear or away from the enemy. (FM 3-90)
  retrograde of material — An Army logistics function of returning materiel from the owning or using unit back
  through the distribution system to the source of supply, directed ship to location, or point of disposal. (ATP 4-
  93)
  return to duty — A patient disposition which, after medical evaluation and treatment when necessary, returns a
  Soldier for duty in his unit. (FM 4-02)
  riot control agent — (DOD) Any chemical, not listed in a schedule of the Convention on the Prohibition of the
  Development, Production, Stockpiling and Use of Chemical Weapons and on their Destruction that can
  produce rapidly in humans sensory irritation or disabling physical effects that disappear within a short time
  following termination of exposure. (JP 3-11) Also called RCA.
  risk — Probability and severity driven chance of loss, caused by threat or other hazards. (ATP 5-19)
  risk assessment — (DOD) The identification and assessment of hazards (first two steps of risk management
  process). (JP 3-26) Also called RA.
  risk decision — A commander, leader, or individual’s determination to accept or not accept the risk(s)
  associated with an action he or she will take or will direct others to take. (ATP 5-19)
  risk management — (DOD) The process to identify, assess, and control risks and make decisions that balance
  risk cost with mission benefits. (JP 3-0) Also called RM.
  risk tolerance — The level of risk the responsible commander is willing to accept. (ATP 5-19)
  role — The broad and enduring purpose for which the organization or branch was established. (ADP 1-01)
  rolling resistance — The force components acting on a train in a direction parallel with the track, which tend to
  hold or retard the train’s movement. (ATP 4-14) Also called RR.
  route — The prescribed course to be traveled from a point of origin to a destination. (FM 3-90)
  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)
  rule of law — A principle under which all persons, institutions, and entities, public and private, including the state
  itself, are accountable to laws that are publicly promulgated, equally enforced, and independently adjudicated,
  and that are consistent with international human rights principles. (FM 3-07)
  rules of engagement — (DOD) Directives issued by competent military authority that delineate the
  circumstances and limitations under which United States forces will initiate and/or continue combat
  engagement with other forces encountered. (JP 3-84) Also called ROE.
  running estimate — The continuous assessment of the current situation used to determine if the current
  operation is proceeding according to the commander’s intent and if planned future operations are supportable.
  (ADP 5-0)
  running track — Tracks that extend the entire length of the yard and provide a route of travel to any point in the
  yard independent of the switching leads and classification tracks. (ATP 4-14)
  ruse — (DOD) In military deception, an action designed to deceive the adversary, usually involving the
  deliberate exposure of false information to the adversary’s intelligence collection system. (JP 3-13.4)
  —S—
  sabotage — An act or acts with intent to injure, interfere with, or obstruct the national defense of a country by
  willfully injuring or destroying, or attempting to injure or destroy, any national defense or war materiel,
  premises, or utilities, to include human and natural resources. (ATP 3-05.1)