The Department of Defense, specifically the U.S. Army Contracting Command at Aberdeen Proving Ground, intends to award a sole source contract for a maintenance plan for the SOC-100 Hemispherical Directional Reflectometer to Surface Optics Corporation. The procurement involves annual preventative maintenance, calibration, and on-site repair services for the SOC-100 HDR, which is critical for the operations at the Natick Soldier Systems Center, with a base year and three option years planned. Surface Optics Corporation is uniquely qualified to provide these services as they are the sole manufacturer of the SOC-100 HDR and do not license service representatives from other companies, ensuring no equivalent services are available. Interested parties must express their interest and capability via email to the designated contacts by 1400 HRS EDT on August 22, 2025, as this is not a request for proposals and no solicitation document will be issued.