FM 3-0: Operations

FM 3-0 is the Army's capstone warfighting manual. The 2022 edition reflects a fundamental shift in Army doctrine: after two decades of counterinsurgency-focused operations, the Army reoriented to Large-Scale Combat Operations (LSCO) against peer and near-peer adversaries capable of contesting every domain — land, air, maritime, space, and cyberspace.

Multi-Domain Operations (MDO)

MDO is the Army's operational concept for how U.S. ground forces, as part of the Joint Force, compete, penetrate enemy anti-access and area denial (A2/AD) systems, and exploit windows of advantage across all domains.

The Three MDO Challenges Against a Peer Adversary

1. Competition — below the threshold of armed conflict; adversary uses political, economic, informational, and proxy forces to achieve objectives without triggering a military response
2. Penetration — cracking the layered A2/AD network that a peer adversary builds to prevent U.S. force projection; requires converging multi-domain fires and effects
3. Disintegration — once inside the A2/AD network, simultaneously collapsing enemy systems faster than they can reconstitute

Domains

Unified Land Operations

The core of FM 3-0's operational concept: Army forces achieve the land force end state through a combination of offensive, defensive, and stability operations — conducted simultaneously across the depth of the operational area.

Offensive Operations

Purpose: Seize, retain, and exploit the initiative.

Types of offensive operations:

• Movement to Contact — locate the enemy when his position is unknown
• Attack — destroy or defeat enemy forces or seize terrain (hasty or deliberate)
• Exploitation — rapidly exploit the success of an attack before the enemy reconstitutes
• Pursuit — destroy a retreating enemy force; prevent them from reaching a new defensive position

Operational Framework for the Offense:

• Deep — attack enemy capabilities before they reach the close fight (long-range fires, CAS, SOF)
• Close — decisive engagement with the main enemy force
• Rear — protect sustainment, command, and communication nodes

Defensive Operations

Purpose: Defeat an attack, buy time, economize forces, or deny terrain.

Types of defensive operations:

• Area defense — retain terrain; subordinate units occupy and fight from assigned AOs
• Mobile defense — use a fixing force and a striking force; destroy the attacker through maneuver
• Retrograde — planned rearward movement (delay, withdrawal, retirement) not driven by enemy pressure

Key defensive principles:

• Depth — no single defensive line; echeloned positions with mutual support
• Flexibility — reserves positioned to reinforce, counterattack, or conduct passage of lines
• Disruption — shaping fires in depth to disorganize the attacker before contact

Stability Operations

Purpose: Establish or restore conditions that enable a legitimate civil authority.

Stability tasks (DIME-focused):

• Establish civil security
• Establish civil control
• Restore essential services
• Support governance
• Support economic and infrastructure development

FM 3-0 recognizes that in most operational environments, all three — offense, defense, and stability — occur simultaneously in different parts of the AO. A battalion attacking an objective in the north may be conducting stability operations in the south in the same battle space.

Combined Arms Maneuver

The combat power of the land force comes from combining all available arms — infantry, armor, artillery, engineers, aviation, air defense, cyber/EW, and sustainment — so that each arm's strengths cover the others' vulnerabilities.

Core Combined Arms Relationships

Mission Command

FM 3-0 grounds operational effectiveness in mission command — the philosophy that decentralized execution, enabled by disciplined initiative and shared understanding of intent, out-competes a centralized, process-driven adversary.

Mission Command Principles

1. Build cohesive teams through mutual trust
2. Create shared understanding — common picture of the operational environment, mission, and intent
3. Provide clear commander's intent — purpose, key tasks, end state
4. Exercise disciplined initiative — act within intent without waiting for orders when opportunity arises or plans fail
5. Use mission orders — assign tasks with intent, not detailed instructions
6. Accept prudent risk — calculated risk-taking is essential; zero-defect mindset produces paralysis

The Operational Framework

FM 3-0 uses three frameworks for organizing thought about operations:

• Deep-Close-Rear — spatial organization relative to the close fight
• Shaping-Decisive-Sustaining — purpose of operations within the scheme of maneuver
• Defeat and Stability — the end state dimension: defeat mechanisms employed and stability conditions established

Multi-Domain Task Force (MDTF)

FM 3-0 introduces the MDTF as the Army's formation for providing multi-domain effects to the Joint Force:

• Long-range precision fires (strategic-level ranges)
• Space and cyber effects
• Electronic warfare
• Intelligence and targeting at echelon

MDTFs operate across theater, not within a division or corps AO — they exist to punch through A2/AD networks and create windows of advantage that ground forces exploit.