The Department of Defense, through the Defense Information Systems Agency (DISA), is seeking proposals for the Spectrum Information System (SIS) Sustainment & Enhancement project. This opportunity is specifically set aside for small businesses and involves custom computer programming services to enhance and sustain the SIS, which plays a critical role in managing spectrum resources for military operations. The work is to be performed in Annapolis, Maryland, and interested parties should contact Quin Conerly-Anderson at quin.s.conerly-anderson.civ@mail.mil or 667-891-2946, or Ramona Lin at ramona.y.lin.civ@mail.mil or 301-225-2159 for further details. The presolicitation notice indicates that the procurement process is underway, and small businesses are encouraged to participate.