The opportunity involves the procurement of 123 spare parts for the Patriot Missile Weapon System, which will be added to an existing subsumable contract under a negotiated umbrella agreement. The contract is a 5-year, firm-fixed-price Indefinite Delivery Requirements contract, sole-sourced to Raytheon as the original equipment manufacturer due to proprietary requirements. No other sources are currently known, but interested firms can seek source approval for future competition by contacting the U.S. Army’s engineering authority. The acquisition is restricted under export control laws, and foreign firms must process requests through their embassies. Potential subcontracting expressions of interest will be forwarded to the identified OEM.