text: FM 7-100.1________________________________________________________________________________
  Kill Zone
  4-43. A kill zone is a designated area on the battlefield where the OPFOR
  plans to destroy a key enemy target, usually by fire. Kill zones may be within
  any of the zones described above.
  Battle Position
  4-44. Within the AOR of an operational command, tactical-level subordinates
  may occupy battle positions. A battle position is a defensive location designed
  to maximize the occupying unit’s ability to accomplish its mission. A battle
  position is selected such that the terrain in and around it is complementary
  to the occupying unit’s capabilities and its tactical task. There are two kinds
  of battle positions: simple and complex. See Figure 4-3.
  Enemy
  Enemy
  Enemy
  X
  Enemy Enemy
  Complex Battle Position
  Simple Battle Positions
  Figure 4-3. Battle Positions
  4-45. A simple battle position is a defensive location oriented on the most
  likely enemy avenue of approach. Simple battle positions are not necessarily
  tied to complex terrain but often employ as much engineer effort as time allows.
  4-46. Complex battle positions are defensive locations designed to protect the
  units within them from detection and attack while denying their seizure and
  occupation by the enemy. They typically employ a combination of complex
  terrain, C3D measures, and engineer effort to protect combat forces from en-
  gagement by precision standoff attack.