The Supply Chain of Victory: Operational Sustainment in Modern Warfare

Modern warfare depends not only on tactics or weapons, but also on whether a military force may continue operating across distance and under sustained pressure. This ability is called operational sustainment. It includes transportation, fuel, repair, medical support, and troop replacement. Without these systems functioning together, even the strongest battlefield plans may stall. Historical and ongoing conflicts reveal that victory depends not just on movement and attack, but on the infrastructure that makes both possible.

Core Components of Operational Sustainment

Operational sustainment refers to the systems that keep military operations functioning after combat begins. These include:

• Transportation – Moving troops, fuel, weapons, and supplies by land, air, or sea. When transport fails, operations may halt.
• Maintenance – Repairing vehicles, weapons, and communications at the front or rear. Without maintenance, equipment becomes a liability.
• Medical support – Treating, evacuating, and rehabilitating the wounded. This preserves fighting strength and morale.
• Manpower replacement – Replacing lost, injured, or fatigued personnel with trained reinforcements. Sustained combat requires continuous renewal.

Each of these pillars supports the others. If one fails, the entire operation may lose momentum.

Sustainment and Strategic Reach

Every strategy is shaped by what logistics may support. A campaign may only advance as far as its fuel and medical systems may carry it. A unit may only hold if its equipment remains functional and its personnel remain sustained. When logistics fall out of sync with plans, the strategy may fail before it begins.

Russia’s Centralized Model Under Pressure

Russia began its 2022 invasion of Ukraine with approximately 190,000 troops. Its logistics model was designed for short-range operations and relied on centralized command and rail infrastructure. As the war expanded, several limitations emerged:

• Rail supply lines were fixed and vulnerable to attack.
• Truck convoys moved slowly and lacked protection.
• Frontline units had little control over their resupply.
• Combat planning was disconnected from sustainment planning.
• Reinforcements included conscripts and penal battalions with limited training and low morale.

These issues led to stalled offensives, abandoned equipment, and diminished combat power.

Ukraine’s Decentralized and Adaptive Approach

Ukraine applied a NATO-style, decentralized logistics model. Local commanders were empowered to manage sustainment near the front. This structure allowed rapid adaptation. Key features included:

• Truck-based supply networks that reduced reliance on rail.
• Brigade-level logistics control for faster decision-making.
• Forward repair teams that returned equipment to service quickly.
• A layered medical system for treating and evacuating the wounded.
• Rotational deployments to prevent fatigue and maintain readiness.

This model helped Ukraine remain flexible in dynamic environments.

The 155th Brigade: A Case of Logistical Disconnection

In 2023, Ukraine deployed the 155th Brigade to a contested zone near Pokrovsk. The unit, reportedly trained and equipped in France with around 1,700 personnel, entered combat before it was fully integrated into Ukraine’s logistics and command systems. Reports identified several issues:

• Supply lines were underdeveloped and inconsistent.
• Communication with supporting commands was limited.
• Timely resupply and maintenance were unavailable.
• Casualties mounted, and performance declined.

This case illustrates how even elite, well-equipped units may underperform when logistics are not synchronized with operations.

Manpower as a Sustainment Factor

Personnel readiness is a critical aspect of sustainment. Replacing combat losses must not degrade force effectiveness.

• Russia relied on conscription and penal units. Many replacements lacked discipline and proper training.
• Ukraine mobilized civilians quickly. Some brigades were prepared, but others lacked time for full readiness.

Troop replacement must maintain unit cohesion and capability. Poorly integrated reinforcements may weaken rather than strengthen.

A Historical Echo: The Wonsan Landing

In October 1950, following the Inchon landing, U.S. forces attempted a second amphibious assault at Wonsan. The operation faced immediate logistical problems:

• The 1st Marine Division spent seven days afloat awaiting mine clearance, known by troops as “Operation Yo-Yo.”
• The 7th Infantry Division waited ten days in Pusan before being diverted north to Iwon.
• South Korean troops had already secured Wonsan before U.S. troops landed.
• No combat occurred, but fuel, shipping, and planning resources were diverted.

The operation failed to achieve strategic impact and disrupted momentum. It serves as a cautionary example of logistics being overlooked.

Strategic Lessons from Ukraine, Russia, and Korea

• Logistics shape strategy – Plans must align with what sustainment may deliver.
• Centralization adds friction – Russia’s model slowed response in fluid conditions.
• Decentralization adds speed – Ukraine’s approach enabled flexibility under fire.
• Personnel systems matter – Reinforcements must be trained and integrated.
• History repeats – From Wonsan to Pokrovsk, ignoring logistics leads to setbacks.

Strategic Reflections

• Failure risk – Transport and personnel systems often collapse first under pressure.
• Flexibility – Decentralized logistics may build resilience in unstable environments.
• Long-term vision – Iraq and Afghanistan showed how sustainment shapes outcomes.
• Training – Leaders with logistics fluency may align strategy with operational reality.

Conclusion

Operational sustainment is not background support. It is the invisible framework that powers movement, response, and survival. Russia’s model failed to scale. Ukraine’s logistics allowed resistance to continue. The Wonsan landing showed how even disciplined forces may falter when logistics are misaligned. Victory in war depends on more than plans. It depends on the fuel truck, the mechanic, the medic, and the replacement convoy. In future conflicts, the most successful strategies will be those built to last.