text: FM 7-100.1________________________________________________________________________________
  PHASE I
  9-49. The first phase includes all actions taken to destroy enemy aircraft and
  control systems before they are employed. It targets aircraft while they are
  still on the ground at airfields or in marshalling or staging areas. This “basing
  area” extends from enemy home territory, to allied basing and staging areas,
  to and including in-theater enemy support areas down to enemy division
  level.1 It is the area in which aircraft are based, refueled, maintained, and
  resupplied. This area is the overall responsibility of the OPFOR theater
  commander. A large part of it could be given an OSC. Part of the area as-
  signed could fall within the OSC’s disruption zone, which can include enemy
  airfields and attack helicopter forward arming and refueling points (FARPs).
  Planning
  9-50. Planning for Phase I begins at the national level, when the General
  Staff is considering various contingency plans for possible strategic campaigns
  before the actual threat of war or extraregional intervention. This planning in-
  cludes any OSCs that might be involved in a particular contingency.
  9-51. Each contingency plan developed includes detailed analysis of the area
  involved, including the identification of key airfields, facilities, and lines of
  communication (LOCs) that could support enemy air operations. In those
  areas controlled by the OPFOR, preparations are made to support planned
  missions. These include the identification of complex terrain in the vicinity of
  identified targets, potential cache sites, and forces to perform missions.
  9-52. Areas not in the direct control of the OPFOR, but anticipated to be
  included in the contingency, are also analyzed. In this case, in addition to all
  the factors mentioned above, planners would also examine potential means
  and routes of infiltration and potential sources of supply. They would also try
  to identify potential “affiliated” forces that could assist in attacking key
  targets: insurgent groups, groups with ethnic ties to the OPFOR, groups that
  sympathize with the OPFOR for political reasons, individual sympathizers,
  terrorist groups, and even criminal organizations.
  9-53. Based on this information, planners identify key targets and missions
  and task OPFOR units and/or affiliated forces to be prepared to perform
  them. This information is shared with the OSCs assigned to the particular
  contingency, and the planning effort is coordinated with them.
  9-54. What is developed is an integrated plan consisting of a large number of
  tactical actions that support air defense objectives at all levels. This is the
  basic plan from which the OPFOR operates at the initiation of hostilities. It
  is modified and updated and new missions are assigned as the contingency
  situation develops.
  9-55. Plans are developed which, taken as a whole, may constitute a battle or
  operation within the designated area. This is particularly true in the basing
  area, since most of the forces operating there will be small units. Their ac-
  tions are timed to occur simultaneously or sequentially to achieve a result
  over time. For example, a series of actions against an airfield, set to occur
  1
  For U.S. forces other than aviators, this phase may present the greatest threat.