This notice announces a sole source firm-fixed-price contract for annual Green Hills Software support renewals for the Naval Air Warfare Center at China Lake. The software is proprietary, so Green Hills Software, located in Santa Barbara, CA, is the only source. This is not a request for quotes, and no solicitation will be issued. Interested parties must maintain an active SAM registration and meet certification requirements for Controlled Unclassified Information access. The contract will be awarded directly to Green Hills Software as the sole supplier.