Final answer:
The requirement to purchase equipment that was previously developed at Government expense and sold exclusively to the military is categorized as a non-developmental item.
Step-by-step explanation:
The requirement to purchase equipment that was previously developed at Government expense and sold exclusively to the military is categorized as a non-developmental item. Non-developmental items are existing commercial items or previously developed items that have been sold or licensed to the government. They require minimal or no modifications before being used by the government.