The Department of Defense, specifically the U.S. Army Contracting Command-Redstone, is seeking information from potential suppliers for the procurement of a 9721-A Secondary Calibration System. This system is essential for accurately calibrating laboratory-grade microphones and includes various hardware components, mains cables for different regions, technical documentation, and calibration software, along with support agreements for installation and training. The procurement is critical for maintaining precise audio measurement capabilities that support military operations, with delivery expected at Redstone Arsenal, Alabama. Interested parties are invited to submit white papers detailing their capabilities by April 16, 2025, to the designated contacts, Taylor Siskoff and Lisa Armes, via email.