This is a pre-solicitation notice for a single-award ID/IQ R&D contract with a maximum ordering amount of approximately $490,000,000 and a 72-month ordering period to develop and prototype Counter-small Unmanned Aircraft System (C-sUAS) capabilities. The effort is set aside for small businesses under NAICS code 541715 with a 1,500-employee size standard. The primary performance location is the Air Force Research Laboratory, Information Directorate in Rome, NY. A technical library is available to potential offerors, who must request access through specified government personnel.