Installing DOD Military CAC Certificates on macOS Catalina – Draft
https://www.youtube.com/watch?v=pUi0HukgJbc
In the Keychain Access app on your Mac, select a keychain from one of the keychains lists, then double-click a certificate. Next to Trust, click the arrow to display the trust policies for the certificate. To override the trust policies, choose new trust settings from the pop-up menus.