On Feb. 12, 2020, Chris Carr, left, and Scott Howard, Instrumentation, Data and Controls engineers at Arnold Air Force Base, Tenn., set up the Cross-Domain Solution hardware before connecting it to a desktop computer at Arnold to demonstrate how it is used. The CDS interface was researched as a solution to allow Plant Operations Systems outside of the Plant Control Room to remain unclassified during classified test programs. (U.S. Air Force photo by Deidre Moon) (This image has been altered by obscuring items for security purposes)