text: Defense
  lubricants [POL]), and class V. Sustainment support to the security area must include planning for both
  ground and aerial medical evacuation of long duration observation posts. BCT sustainment planners also
  consider cross leveling classes of supply and sustainment assets upon transition from the offense to the
  defense.
  7-68. Enemy actions and the maneuver of combat forces complicate forward area medical operations.
  Defensive operations must include health service support to medical personnel who have much less time to
  reach a patient,apply tactical combat casualty care (TCCC),and remove the patient from the battlefield. The
  enemy’s initial attack and the BCT’s counterattack produce the heaviest patient workload. These are also the
  most likely times for enemy use of artillery and CBRN weapons. The enemy attack can disrupt ground and
  air routes and delay evacuation of patients to and from treatment elements. The depth and dispersion of the
  defense create significant time distance problems for medical evacuation assets. (For additional information
  on the tactics,techniques,and procedures associated with health service support,see FM 4-02,ATP 4-02.2,
  and ATP 4-02.3.)
  PROTECTION
  7-69. The BCT must take measures to protect against all acts designed to impair its effectiveness and prevent
  the enemy from gaining an unexpected advantage. Because a force defends to conserve combat power for
  use elsewhere or later, the commander must secure the force. The BCT ensures security by employing
  security forces and surveillance assets throughout the depth and breadth of its assigned area of operations.
  The BCT may employ counterreconnaissance,combat outposts,a screen or guard force,and other security
  operations tasks to provide this security. Information related capabilities and CEMA aid in securing the force
  and confuse the enemy as to the manner of defense.
  7-70. As discussed in chapter 6, personnel and physical assets have inherent survivability—a quality or
  capability of military forces which permits them to avoid or withstand hostile actions or environmental
  conditions while retaining the ability to fulfill their primary mission (ATP 3-37.34),which can be enhanced
  through various means and methods. One way to enhance survivability when existing terrain features offer
  insufficient cover—protection from the effects of fires and concealment—protection from observation
  or surveillance is to alter the physical environment to provide or improve cover and concealment. Similarly,
  natural or artificial materials may be used as camouflage to confuse,mislead,or evade the enemy. Together,
  these are called survivability operations—those protectionactivities that alter the physical environment by
  providingor improvingcover,camouflage, and concealment (ATP 3-37.34).
  7-71. All BCT units conduct survivability operations within the limits of their capabilities. Engineer and fire
  support assets have additional capabilities to support survivability operations. Engineer support to
  survivability operations is a major portion of the enhance protection line of engineer support (see FM 3-34).
  Fire support to survivability operations includes the employment of obscurants, which forces can use to
  enable survivability operations by concealing friendly positions and screening maneuvering forces from
  enemy observation and support to disengagement or movement of forces. (See ATP 3-11.50.)
  7-72. CBRN support to survivability operations includes the ability to assess,protect and mitigate the effects
  of contamination. CBRN reconnaissance provides support by locating and marking contaminated areas and
  routes,allowing maneuver forces to avoid unnecessary exposure. Reconnaissance teams are focused on the
  collection of tactical and technical information to support survivability of friendly forces and facilities.
  7-73. Although survivability encompasses capabilities of military forces both while on the move and when
  stationary, survivability operations focus more on stationary capabilities—constructing fighting and
  protective positions and hardening facilities. In the case of camouflage and concealment, however,
  survivability operations include both stationary and on-the-move capabilities. Conducting survivability
  operations is one of the tasks of the protection warfighting function, but forces can also use survivability
  operations to enable other warfighting functions. For example,military deception,part of the command and
  control warfighting function,can be enabled by the use of survivability operations intended to help mislead
  enemy decision makers. This may include the use of dummy or decoy positions or devices. (SeeFM3-13 for
  additional information.)
  7-74. Ground-based air defense artillery units execute most Army air and missile defense operations though
  air and missile defense support to the BCT may be limited. Subordinate units of the BCT should expect to