Hi Dsin,
Welcome to Centrify.
If you are using 10.12, this is because Apple has dropped out the SystemCACertificates.keychain in this release(Sierra). To solve this issue, please import those DoD certificates or intermediate certificates into system keychain instead.
To have more information on this issue, please see the below thread:
Hope this helps. Please feel free to reach us if you need any assistance.
Best Regards,
Albert