text: Chapter 8
  decreases the Soldier’s ability to identify enemy aircraft. During extended or long movements and marches,
  Soldiers are assigned air guard duties in shifts. (See ATP 3-21.18 and ATP 3-21.8 for additional information.)
  Force Health Protection
  8-191. The nature of area security in support of stability-focused tasks requires the BCT surgeon to stress
  planning for the provision of preventive medicine, veterinary services, and combat and operational stress
  control over that inherent in supporting offensive- and defensive-focused tasks. The BCT’s area security
  mission focused within the conduct of stability-focused tasks interacts with the civilian population of its area
  of operations to a far greater degree. Under these conditions, the probability of Soldiers exposure to zoonotic
  diseases, toxic industrial chemicals and other pollutants, and bad food and water increases. The prolonged
  tours of duty typically associated with these operations and the enemy’s use of unconventional weapons,
  such as mines and suicide bombers, tends to increase psychiatric casualties. The BCT surgeon coordinates
  the employment of combat stress teams with the chaplain to best meet the needs of BCT Soldiers for stress
  control. (See ATP 3-91 and ATP 4-02.8 for additional information.)
  Chemical, Biological, Radiological, and Nuclear Operations
  8-192. CBRN operations are the employment of capabilities that assess, protect against, and mitigate the
  entire range of CBRN incidents to enable freedom of action. CBRN operations support operational and
  strategic objectives to counter WMD and operate safely in a CBRN environment. An effective CBRN defense
  by the BCT counters enemy threats and attacks and the presence of toxic industrial materials in its area of
  operations by minimizing vulnerabilities, protecting friendly forces, and maintaining an operational tempo
  that complicates enemy or terrorist targeting.
  8-193. The BCT employs key CBRN passive defense activities organized within two overarching CBRN
  principles (protection and contamination mitigation, see figure 7-3 on page 7-18) to survive and sustain area
  security operations in a CBRN environment. The BCT commander and staff, in coordination with the division
  or higher headquarters, integrate these principles regardless of the mission type.
  8-194. The commander considersthe requirement for CBRN support if evidence exists that enemy forces
  or terrorists have employed CBRN agents or have the potential for doing so. A mix of different CBRN units—
  such as decontamination, hazard response, reconnaissance, and surveillance—are necessary to balance
  capabilities. The CBRN staff officer at the BCT and battalion/squadron participates in the intelligence process
  to advise the commander of commercial and toxic industrial materials in the local area. (See ATP 3-91 and
  FM 3-11 for additional information.)
  Convoy Security
  8-195. Convoy security is a specialized kind of area security operations conducted to protect convoys. Units
  conduct convoy security operations anytime there are insufficient friendly forces to secure routes
  continuously in an area of operations and there is a significant danger of enemy or adversary ground action
  directed against the convoy. The BCT may conduct convoy security operations in conjunction with route
  security operations within its area of operations. Planning includes designating units for convoy security;
  providing guidance on tactics, techniques, and procedures for units to provide for their own security during
  convoys; or establishing protection and security requirements for convoys carrying critical assets. Local or
  theater policy typically dictates when or which convoys receive security and protection. (See ATP4-01.45
  for additional information.)
  PREPARATION
  8-196. During preparation activities, the BCT continues to plan, train, organize, and equip for area security
  missions within its area of operations. The conduct of preparation activities in support of stability-focused
  tasks is essentially the same as for offensive- and defensive-focused tasks. (See ADP 5-0 for a complete
  discussion.) However, factors that distinguish stability-focused tasks are the increased requirement for
  interagency coordination at BCT level and below and the demands on the BCT and subordinate staffs to
  perform tasks or functions outside their traditional scope of duties. The commander’s realignment of