According to DISA the CompTIA Advanced Security Practitioner (CASP) is now 8570 approved. http://iase.disa.mil/eta/iawip/content_pages/iabaseline.html
This is great news for those looking for a more affordable alternative to CISSP for IAT level III and IAM level II compliance.
As one of the first recipients of the CASP I am absolutely thrilled by this and feel DISA has chosen the correct categorization for this certification. It's a very tough certification - and requires the person taking the certification to have hands-on experience with multiple security and networking technologies.
If you're looking to take the CASP I would recommend taking practice exams for the CompTIA Security+, CISSP, and Cisco CCNP. You can access all of these practice exams for free at my Career Tools blog.