ABSRACT: The AN/BQQ-10(V) Acoustic Rapid Commercial off-the-shelf (COTS) Insertion (A-RCI) submarine sonar system has been repeatedly cited as one of the Department of Defense's premier examples of using COTS technology to provide significantly improved system performance at far lower costs than previously possible. The ability to rapidly and inexpensively upgrade a ship's sonar hardware suite to provide continually increasing sonar performance has helped to restore United States submarine superiority over all potential adversaries. As part of this revolution in RCI, the program has identified several lessons on using COTS hardware and software that can help other programs making the same leap into the COTS world.