Yes, and all the real data about that is on a separated computer and network system, with separate infrastructure. You require physical access to a terminal and getting even that is difficult. The entitlements on the system itself are very specific, very limited, and have multiple approval authorities for each person. The regular, external facing network and systems are mostly just for emails, memos, things like that. General business operations.

Super secret stuff only happens in SCIFs and vaults.