OPM: Office of Personnel Management, where all the 'blackmail' files for cleared gov employees and contractors are stored, in addition to many other more mundane functions.
https://en.wikipedia.org/wiki/Office_of_Personnel_Management...
DoD: Department of Defense, but this also refers to contractors in places like Lockheed and other smaller contrating firms.
SF-86: Standard Form #86, the form that must be completed to gain any kind of clearance with the gov. These clearance processes can run into the $20k+ range, though not usually, as they have to send agents out to talk to people to verify the applicant.
https://en.wikipedia.org/wiki/Standard_Form_86
https://news.clearancejobs.com/2017/05/31/serious-penalties-...
The 2015 data breach of the OPM was a BIG deal in the security clearance world, as it seems all the blackmail files were stolen. The a large issue was that the OPM worked on an entirely separate internet that the gov built, as in they had totally different wires and cables and everything, very expensive. How this happened is yet to be released AFAIK. Also, many people were trusting the gov with their darkest secrets, so as to be un-blackmail-able by others. Now, the gov is not so trustworthy and this then throws a huge wrench into all of the processes, including retention of employees and recruitment of new ones.