How do I fulfill MILS security requirements on RHEL 6?

Issue

• MILS Security support
• we have a strong requirement to offer a technical solution that handle MILS security. SELinux offers MLS, RBAC and so on but as far as we know not MILS level.
• Have you ever heard about such type of requirement and did you know a way to answer with RHEL (+some product if needed) to fulfil MILS requirement ?
• If yes can you help us to find a way to answer with RedHat instead of others products dedicated to embedded system which support MILS.