text: *FM 4-0
  Field Manual Headquarters
  No. 4-0 Department of the Army
  Washington, DC, 14 August 2024
  SUSTAINMENT OPERATIONS
  Contents
  Page
  Preface ................................................................................................................................................. vii
  Introduction .......................................................................................................................................... ix
  CHAPTER 1 ........................................................................................................................................... 1
  ARMY SUSTAINMENT OPERATIONS ......................................................................................... 1
  Section I – Overview of Army Sustainment .......................................................................... 1
  Sustainment Warfighting Function ............................................................................................ 1
  Principles of Sustainment .......................................................................................................... 2
  Section II – Overview of Army Operations ............................................................................ 3
  Strategic Contexts ..................................................................................................................... 4
  Large-Scale Combat Operations ............................................................................................... 5
  Tenets of Operations ................................................................................................................. 6
  Imperatives ................................................................................................................................ 7
  Section III – The Operational Environment ......................................................................... 10
  Contested Logistics Environment ............................................................................................ 10
  Logistics Threats ..................................................................................................................... 11
  Contested Logistics Challenges And Planning Considerations .............................................. 12
  Section IV – Sustainment Support to Multidomain Operations ........................................ 15
  Enable Freedom of Action, Extend Operational Reach, and Prolong Endurance .................. 18
  Authorities and Responsibilities............................................................................................... 19
  Army Title 10 Sustainment Requirements ............................................................................... 22
  Army Executive Agent Responsibilities ................................................................................... 22
  CHAPTER 2 ......................................................................................................................................... 25
  ARMY SUSTAINMENT AT ECHELON ........................................................................................ 25
  Section I – Levels of Warfare................................................................................................ 25
  Section II – Overview of National Strategic Level of Warfare ........................................... 26
  United States Transportation Command ................................................................................. 26
  DISTRIBUTION RESTRICTION: Approved for public release; distribution is unlimited.
  *This publication supersedes FM 4-0, dated 31 July 2019; FM 4-01, dated 3 April 2014; FM 4-30, dated 1 April
  2014; and FM 4-40, dated 22 October 2013.