From someone who is configuring embedded systems using RHEL 6 retroactively imposing a CAT 1 finding on systems already deployed which are not using SE Linux could jeopardize military combat systems.  We are deploying systems on embedded computers using RHEL and have not used SE Linux because of software compatibiulity issues including McAfee HBSS problems with SE Linux.  In RHEL 5 the non-use of SE Linux is not a CAT 1. To RETROACTIVELY impose SE Linux on RHEL 6 systems already being deployed could result in the removal of core computers from defense networks bringing down warfighting capabilities.
 
In order to keep our defense networks intact SE Linux should be kept at CAT 2 medium.