EDB Postgres Advanced Server STIG becomes first open source-based database STIG to be published by the Department of Defense
Government-validated security guide increases speed and security for U.S. agencies’ deployment of EDB Postgres
I think that calling EDB an "open source-based database" may be technically correct, but perhaps a bit misleading. It is a commercial database derived from an open source database. And they do contribute back to the PostgreSQL community. I'm just being picky.
The actual site containing the paper, and others, is here: