Sustainment maintenance is normally performed by which group?

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Sustainment maintenance relies on a centralized, capable network that can handle complex repairs, overhauls, and a steady flow of parts over long campaigns. National providers—organized as central repair facilities or depots—have the scale, standardized processes, and access to the full supply chain needed to keep equipment ready across the force. They can perform heavy maintenance, rebuilds, and updates that exceed what a field unit can accomplish, and they coordinate with logistics and maintenance data systems to sustain readiness over time.

Field unit mechanics play a vital role in routine servicing, minor repairs, and quick turnarounds, but their capacity is limited by location, tooling, and parts availability. Local contractors can provide supplemental support, yet the reach and integration required for sustained operations come from national-level providers who manage the larger maintenance pipeline and ensure consistency across units and theaters.