Hello!
The best place to download the needed certs is here;
https://militarycac.com/macnotes.htm#DoD_certificates
It looks like these downloads should contain;
DOD CA-27 through DOD CA-32,
DOD EMAIL CA-27 through DOD EMAIL CA-34,
DOD EMAIL CA-39 through DOD EMAIL CA-44,
DOD ID CA-33 through DOD ID CA-34,
DOD ID CA-39 through DOD ID CA-44,
DOD ID SW CA-35 through DOD SW ID CA-38,
DOD ID SW CA-45 through DOD SW ID CA-48, and
DoD Root CA 2 through DoD Root CA 4
You will want to review the steps to import listed on the miliarycac.com site in case the Mac falls into the categories identified regarding trust issues, etc, but hopefully this solves the problem for any Users where importing from the desktop did not help.
Note once imported from the desktop, the .keychain or p7b files do not need to be saved, and can be removed.
To add the new p7b files, click each of the files once downloaded, and then import to "Login" keychain, as instructed on the militarycac.com site.
Please let me know if this solves the issue for anyone where copying the SystemCACertificate.keychain to the desktop and then adding it as a System keychain did not help.
Thank you!
Ryan V.