text: Glossary
  obstacle zone
  A division-level command and control measure to designate specific land areas where lower echelons
  are allowed to employ tactical obstacles. (JP 3-15)
  *occupy
  A tactical mission task in which a unit moves into an area to control it without enemy opposition.
  offensive operation
  An operation to defeat or destroy enemy forces and gain control of terrain, resources, and population
  centers. (ADP 3-0)
  operation
  A sequence of tactical actions with a common purpose or unifying theme. (JP 1, Vol 1)
  operational environment
  The aggregate of the conditions, circumstances, and influences that affect the employment of
  capabilities and bear on the decisions of the commander. (JP 3-0)
  operations security
  A capability that identifies and controls critical information, indicators of friendly force actions
  attendant to military operations, and incorporates countermeasures to reduce the risk of an adversary
  exploiting vulnerabilities. (JP 3-13.3)
  operational variables
  A comprehensive set of information categories used to describe an operational environment.
  (ADP 1-01)
  *passage lane
  A lane through an obstacle that provides safe passage for a passing force.
  passage of lines
  An operation in which a force moves forward or rearward through another force’s combat positions
  with the intention of moving into or out of contact with the enemy. (JP 3-18)
  *passage point
  A designated place where passing units pass through the stationary unit.
  *penetration
  A form of maneuver in which a force attacks on a narrow front.
  phase line
  An easily identified feature in the operational area utilized for control and coordination of military
  operations. (JP 3-09)
  point of breach
  The location at an obstacle where the creation of a lane is being attempted. (ATP 3-90.4/MCTP 3-34A)
  point of departure
  The point where the unit crosses the line of departure and begins moving along a direction of attack.
  (ADP 3-90)
  point of penetration
  The location, identified on the ground, where the commanders concentrate their efforts at weakest
  point of the enemy to seize a foothold on the far side objective. (ATP 3-90.4/MCTP 3-34A)
  policing
  The application of control measures within an area of operation to maintain law and order, safety, and
  other matters affecting the general welfare of the population. (FM 3-39)
  *position area for artillery
  An area assigned to an artillery unit to deliver surface to surface fires.