I have some scripts that are probably still "beta" from a project on GitHub by the RedHatGov organization (Red Hat, Inc. government sector employees).
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While their project is not complete, nor universally applicable, it is a great start and I plan on forking, contributing, and requesting pulls for the projects.
Frank Cavvigia of Red Hat has also made this script publicly available (by forking the code from other projects such as Aqueduct), which will modify a RHEL 6.4 .iso with many settings and requirements for DISA STIG compliance. This creates a new .ISO you can burn and use to install a system with many compliant options from the get-go.
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I have tested this script, with minor modifications, on CentOS 6.5 and it has been somewhat successful. Someday when I get it cleaned up I will document and share my findings/changes.