Probably Optiplex given its use in high-security defense sector which, combined with Separation Kernel Protection Profile, would have all kinds of security/hard

Probably Optiplex given its use in high-security defense sector which, combined with Separation Kernel Protection Profile, would have all kinds of security/hardening requirements: https://gdmissionsystems.com/cyber/products/trusted-computing-cross-domain/trusted-multilevel-computing-solution https://gdmissionsystems.com/cyber/products/trusted-computin... http://www.integrityglobalsecurity.com/pages/solutions.html http://www.integrityglobalsecurity.com/pages/solutions.html https://www.ghs.com/products/safety_critical/integrity-do-178b.html https://www.ghs.com/products/safety_critical/integrity-do-17... Warning: These companies' marketing folks like to go overboard. Sharing for the technical data and Dell references but not endorsing every claim you see. ;)