text: Army Aviation Operations
  * Allow no enemy to pass through the screen undetected and unreported.
  * Maintain continuous surveillance of all avenues of approach larger than a designated size
  (according to the protected force commander’s intent) into the security area.
  * Destroy or repel all enemy reconnaissance prior to the enemy gaining observation on the
  protected force.
  * During defensive screens, locate the lead elements of the enemy and determine composition and
  direction of movement.
  * Maintain contact with enemy forces and report all activity with the security area.
  * Maintain contact with the protected force main body and friendly security forces operating to its
  flanks.
  * Impede or harass enemy forces within capability while displacing to subsequent screens or
  during battle handover.
  3-106. Screens can be either stationary or moving. Stationary screens are conducted to the front, flanks, or
  rear of a stationary protected force or to the flanks or rear of a moving protected force. Movement to
  contact or zone reconnaissance is conducted to provide security forward of a moving protected force.
  3-107. A stationary screen is established using a series of OP with overlapping fields of observation.
  Using MUM-T with UAS focused on key named areas of interest that require persistent surveillance,
  AWTs/SWTs conduct reconnaissance along the screen line focused on supporting named areas of interest,
  routes, and mobility corridors that support enemy movement. Along the screen line, the aviation security
  force typically remains dynamic and maneuvers between OPs, using terrain to mask movement to ensure
  survivability and overlapping or redundant coverage of named areas of interest. The number of named
  areas of interest and the frequency of coverage by the aviation screening force is driven by how many other
  sensors and ground forces are committed to conducting the screen, the distance the screen is from the
  protected force, and the expected enemy force that is attempting to penetrate the screen. Based on the
  amount of space available for the security area, multiple screens are planned in depth to allow the screening
  force to displace while maintaining contact and developing the situation with enemy forces.
  3-108. A moving screen is tied to the movement rates and axis of advance or attack of the moving
  protected force and is conducted either to the rear (seldom) or to the flanks (primary) of the moving force.
  For a moving flank screen, the screen force screens from the lead combat element (does not include lead
  security and reconnaissance. elements) of the main body of the moving protected force to the rear of the
  protected force. To maintain protection of the moving force, the aviation security force executes a moving
  flank or rear screen similar to a stationary screen with the exception of the movement techniques used to
  occupy successive OPs along the screen line. The advantages and disadvantages of the various movement
  techniques to occupy a moving screen are outlined in table 3-1 and figure 3-19 (page 3-27).
  Table 3–1. Screen movement methods
  Methods Characteristics Advantages Disadvantages
  Alternate • Main body moves faster. • Very secure • Execution takes
  bounds by • Conducted by platoon, method. time.
  observation company, or troop. • Maintains maximum • Disrupts unit
  posts • Contact is possible. surveillance over integrity.
  the security area.
  • Conducted from rear to
  front.
  Alternate • Main body moves faster. • Execution does not • May leave
  bounds by unit • Conducted by platoon, take a great deal of temporary gaps in
  company, or troop. time. coverage.
  • Contact is possible. • Maintains good
  surveillance over
  • Conducted from rear to
  the security area.
  front.
  • Maintains unit
  integrity.