MIL-STD-130N: Identification Marking of U.S. Military Property (PDF)
DFARS 252.211-7003, Item Identification and Valuation Requires items be marked with a unique item identifier (UII) in accordance with MIL-STD-130. Contracting officers are to include the DFARS clause in all solicitations and contracts that require delivery of one or more items that meet the IUID criteria. The provisions of the DFARS clause in the contract are mandatory.