"Some federal employees are not included with these pay figures as the government has concluded employees in some agencies are involved in national security work and that it is not in the public interest to release their individual pay information. Names in these cases will display as "Name unknown" or "Name withheld by agency.""

The only John Spillman as of 2024 was in records and information management. How/Why would he move to 'exterior security'?

https://www.fedsdatacenter.com/federal-pay-rates/index.php?y=2024&n=spillman%2C+john&l=&a=&o=