Not just service members. It was most people who had ever held a security clearance, civilian and military.

Only ones not included were agencies that did not use OPM for background investigations (which was only one or two).

Even then, many of the employees of those agencies previously worked for the ones who used OPM’s systems.

Yup. For a while I was getting love letters from the OPM every quarter or so.

Same - pretty sure I’m still enrolled in whatever credit monitoring they provided for people at the time as well.