text: Glossary
  deception
  Those measures designed to mislead the enemy by manipulation, distortion, or falsification
  of evidence to induce him to react in a manner prejudicial to his interests (JP 1-02).
  decision point
  (Army) An event, area, or point in the battle where and when the friendly commander will
  make a critical decision (FM 3-0).
  decisive operation
  The operation that directly accomplishes the mission. It determines the outcome of a major
  operation, battle, or engagement. The decisive operation is the focal point around which
  commanders design the entire operation (FM 3-0).
  decisive point
  (Joint) A geographic place, specific key event, critical factor, or function that, when acted
  upon, allows commanders to gain a marked advantage over an adversary or contribute
  materially to achieving success. (JP 3-0) [Note: In this context, adversary also refers
  to enemies.]
  defeat
  A tactical mission task that occurs when an enemy force has temporarily or permanently lost
  the physical means or the will to fight. The defeated force’s commander is unwilling
  or unable to pursue his adopted course of action, thereby yielding to the friendly
  commander’s will, and can no longer interfere to a significant degree with the actions
  of friendly forces. Defeat can result from the use of force or the threat of its use (FM 3-90).
  displaced person
  (Army) A civilian who is involuntarily outside the national boundaries of his or her country
  or as an internally displaced person is a civilian involuntarily outside his area or region within
  his country (FM 2-0).
  disrupt
  A tactical mission task in which a commander integrates direct and indirect fires, terrain,
  and obstacles to upset an enemy’s formation or tempo, interrupt his timetable, or cause his
  forces to commit prematurely or attack in piecemeal fashion (FM 3-90).
  doctrine
  Fundamental principles by which the military forces or elements thereof guide their actions
  in support of national objectives. It is authoritative but requires judgment in application
  (JP 1-02).
  defensive operations
  Combat operations conducted to defeat an enemy attack, gain time, economize forces,
  and develop conditions favorable for offensive or stability operations (FM 3-0).
  demobilization
  (Joint) The process of transitioning a conflict or wartime military establishment
  and defense-based civilian economy to a peacetime configuration while maintaining national
  security and economic vitality (JP 4-05).
  destroy
  In the context of defeat mechaisms, to apply lethal combat power on an enemy capability so
  that it can no longer perform any function and cannot be restored to a usable condition
  without being entirely rebuilt (FM 3-0).
  2. A tactical mission task that physically renders an enemy force combat-ineffective until it
  is reconstituted (FM 3-90).