FM 4-0 — Sustainment Operations
FM 4-0 governs Army sustainment operations across the range of military operations, competition contexts, and strategic environments.
- Publication number: FM 4-0
- Title: SUSTAINMENT OPERATIONS
- Date: 03/20/2026
- Proponent: T2COM
- Status: ACTIVE
View FM 4-0 on armypubs.army.mil
It describes sustainment across logistics, financial management, personnel services, and health service support, with considerations for multidomain and maritime operations. It also covers sustainment at echelon, command relationships, operations by operational context, and leadership and training.
Topics covered
- Sustainment warfighting function
- Contested logistics
- Multidomain operations
- Maritime sustainment operations
- Army sustainment at echelon
- Command and support relationships
- Offensive operations
- Sustainment leader development
Questions and answers
What elements make up the sustainment warfighting function?
The sustainment warfighting function consists of four elements: logistics, financial management, personnel services, and HSS, each of which must be integrated and synchronized across all warfighting functions to ensure the appropriate level of support. (paragraph 2)
What are the elements of logistics in FM 4-0?
The elements of logistics are maintenance, transportation, supply, field services, distribution, operational contract support (OCS), and general engineering. (paragraph 1-4)
How long does an attached command relationship last?
An attached command relationship is relatively temporary. (paragraph 2-125)
What types of offensive operations does FM 4-0 identify?
There are four types of offensive operations: movement to contact, attack, exploitation, and pursuit. (paragraph 5-247)
What are riverine operations?
Riverine operations are operations conducted by forces organized to cope with the unique characteristics of a riverine area and/or to achieve or maintain control of the riverine area. (paragraph 6-66)