Hi All!
The SystemCACertificate.keychain has been dropped out since 10.12. The last version that had it pre-loaded was 10.11.6. Please see also below thread for reference:
Actually, all the DoD certificates can be found at the below website which you could download if any DoD intermediate certificates got missing:
https://militarycac.com/macnotes.htm
Oher than loading the DoD certificate into SystemCACertificate.keychain, please try to import it to System Keychain instead. The below will give you the instructions on how to load the DoD Intermediate certificates:
Note: Please replace SystemCACertificate.keychain as System Keychain
Please feel free to contact us if you need any assistance.
Best Regards,
Albert