text: Glossary
  deception means
  Methods, resources, and techniques that can be used to convey information to the deception target.
  (JP 3-13.4)
  deception objective
  The desired result of a deception operation expressed in terms of what the adversary is to do or not to
  do at the critical time and/or location. (JP 3-13.4)
  deception target
  The adversary decision maker with the authority to make the decision that will achieve the deception
  objective. (JP 3-13.4)
  decisive terrain
  Key terrain whose seizure and retention is mandatory for successful mission accomplishment.
  (ADP 3-90)
  *decisively engaged
  A fully committed force or unit that cannot maneuver or extricate itself.
  decoy
  An imitation in any sense of a person, object, or phenomenon that is intended to deceive enemy
  surveillance devices or mislead enemy evaluation. (JP 3-13.4)
  defeat
  To render a force incapable of achieving its objectives. (ADP 3-0)
  defense support of civil authorities
  (DOD) Support provided by U.S. Federal military forces, Department of Defense civilians, Department
  of Defense contract personnel, Department of Defense component assets, and National Guard forces
  (when the Secretary of Defense, in coordination with the governors of the affected States, elects and
  requests to use those forces in Title 32, United States Code, status) in response to requests for
  assistance from civil authorities for domestic emergencies, law enforcement support, and other
  domestic activities, or from qualifying entities for special events. (DODD 3025.18)
  defensive operation
  An operation to defeat an enemy attack, gain time, economize forces, and develop conditions favorable
  for offensive or stability operations. (ADP 3-0)
  delay
  When a force under pressure trades space for time by slowing down the enemy’s momentum and
  inflicting maximum damage on enemy forces without becoming decisively engaged. (ADP 3-90)
  *delay line
  A phase line over which an enemy is not allowed to cross before a specific date and time or enemy
  condition.
  deliberate breach
  The systematically planned and executed creation of a lane through a barrier or obstacle. (ATP 3-90.4/
  MCTP 3-34A)
  deliberate crossing
  The crossing of an inland water obstacle or other gap that requires extensive planning and detailed
  preparations. (ATP 3-90.4/MCTP 3-34A)
  deliberate operation
  An operation in which the tactical situation allows the development and coordination of detailed plans,
  including multiple branches and sequels. (ADP 3-90)
  *demonstration
  A variation of tactical deception used as a show of force in an area where a unit does not seek a
  decision and attempts to mislead an adversary.