What describes the essential technical requirements for purchased material that is military unique or substantially modified commercial items?

The term that describes the essential technical requirements for purchased materials that are military unique or substantially modified commercial items is found in the military specification (MIL-SPEC). Military specifications provide a detailed outline of the standards and requirements necessary for materials and products, ensuring that they meet military operational criteria and quality standards.

Military specifications are crucial in guiding manufacturers and suppliers, as they delineate how products should be constructed, what materials must be used, and what performance characteristics are necessary. This documentation serves to assure that the end products will meet rigorous demands and can function reliably in the specific environments where military items are deployed.

In this context, military detail often refers to more specific variations or formats tied to particular items, while military performance pertains to the performance measures those items must achieve. The military workbook is not a standard classification for technical requirements and is more likely a document used for project management or planning rather than a specification of product requirements. Therefore, the military specification stands as the correct term for defining the essential technical specifications for such bought materials.