Which two major arms coordinate ordnance maintenance and supply within the modern Army logistics system?

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The main idea here is how ordnance work fits into the Army’s overall logistics system. The Ordnance Corps provides the technical expertise for maintaining and supplying weapons, ammunition, and other ordnance items. But the day-to-day management of materiel, parts, storage, procurement, and distribution happens through the Army’s broader logistics and support structure—think Army Materiel Command and the connected supply chains that handle everything from stocking to distribution across units. Together, these two parts—Ordnance expertise and the wider logistics network—coordinate to keep equipment ready and supplied. That’s why the best choice pairs the Ordnance Corps with the broader logistics commands that manage materiel and supply chains. The other options don’t align with how maintenance and supply are organized: engineering handles construction and structural work; infantry or medical commands aren’t the primary coordinators for ordnance logistics.