text: Appendix A
  Figure A-39. Direct fire control measures
  Engagement Criteria
  A-81. Engagement criteria are protocols that specify those circumstances for initiating engagement with an
  enemy force. They may be restrictive or permissive. Commanders establish engagement criteria during direct
  fire planning. Commanders and leaders of small tactical units use engagement criteria in conjunction with
  engagement priorities and other direct fire control measures to mass fires and control fire distribution.
  Engagement Priority
  A-82. Engagement priority identifies the order in which the unit engages enemy systems or functions.
  Commanders assign engagement priorities based on the type or level of threat at different ranges to match
  organic weapon systems capabilities against enemy vulnerabilities. Engagement priorities depend on
  situations. Commanders use engagement priorities to distribute fires rapidly and effectively. Subordinate
  elements can have different engagement priorities. Normally, units engage the most dangerous targets first,
  followed by targets in depth or specialized systems, such as engineer vehicles.