The U.S. Army is seeking qualified sources to provide Contractor Field Service Representative support for the Apache Sensors portfolio, including hardware and software support for the M-TADS/PNVS and Fire Control Radar systems. The contractor will be located at Redstone Arsenal, Alabama, to support Army units both within and outside the continental United States. The anticipated contract is a Firm-Fixed Price and Cost-Plus Fixed Fee Delivery Indefinite Quantity contract with a 60-month base period of performance and an option to extend services for up to six months. Interested offerors must demonstrate access to the Technical Data Package held by Lockheed Martin and Fire Control or explain how to meet requirements without it. This is a sources sought notice for market research and is not a request for proposals.