text: Introduction
  This third edition of FM 1-02.1 compiles all Army terms and definitions approved for use in Army doctrinal
  publications, including ADPs, FMs, and ATPs. It also includes joint and North Atlantic Treaty Organization
  (NATO) terms used and listed in the glossaries of Army doctrinal publications. FM 1 02.1 also lists shortened
  forms (whether considered acronyms or abbreviations) approved for use in Army doctrinal publications.
  This publication is augmented by the military terms and symbols database, known as the Army Dictionary
  online. To maintain Army terminology current, the Army Dictionary online is updated monthly to reflect the
  latest operational term changes published in new editions of Army doctrine publications (To access the
  database, go to https://jdeis.js.mil/jdeis/index.jsp?pindex=207, and log in with a common access card.) This
  database is an official Department of Defense (DOD) website, maintained by the Combined Arms Doctrine
  Directorate in collaboration with the Joint Staff Directorate for Joint Force Development, and is part of the
  Joint Doctrine, Education, and Training Electronic Information System. While the database includes the same
  joint terms appearing in FM 1-02.1, readers should consult the DOD Dictionary of Military and Associated
  Terms for up-to-date joint terminology.
  When communicating instructions to subordinate units, commanders and staffs from company through corps
  echelons should use this publication as a dictionary of operational terms and military symbols.
  FM 1-02.1 is organized as follows:
  Chapter 1 presents defined terms.
  Chapter 2 presents acronyms, abbreviations, and country codes.
  The terminology entries in chapter 1 of this publication fall into three categories:
  Army only doctrine applicable definitions.
  Joint (DOD) definitions used in Army doctrine publications.
  NATO definitions used in Army doctrine publications.
  For each term and definition, a proponent publication is cited in parentheses after the definition.
  Army only applicable doctrine definitions. The Army definition is preceded by “(Army)” if the term also
  has a joint definition that differs from the Army definition. (See the definition for “attack position” listed
  below.) If the term has no associated joint definition, the Army definition is not preceded by “(Army)”. (See
  the definition for “situational understanding” listed below.) All Army-unique definitions must be followed
  by the proponent Army publication in parentheses, as in the following examples:
  attack position — (Army) The last position an attacking force occupies or passes through before crossing
  the line of departure. (ADP 3-90)
  situational understanding — The product of applying analysis and judgment to relevant information to
  determine the relationship among the operational and mission variables to facilitate decision making. (ADP
  6-0)
  Joint (DOD) defined terms that appear in glossaries of Army doctrine publications. Each joint definition
  is preceded by “(DOD).”
  airspace control — (DOD) The exercise of delegated authority over designated airspace and users through
  control procedures and coordination measures to maximize operational effectiveness. (JP 3-52)
  NATO defined terms that appear in glossaries of Army publications. Each NATO definition is preceded by
  “(NATO).”
  international organization — (NATO) An intergovernmental, regional or global organization governed by
  international law and established by a group of states, with international juridical personality given by
  international agreement, however characterized, creating enforceable rights and obligations for the purpose
  of fulfilling a given function and pursuing common aims. (NATOTerm)