I've seen other studies that have suggested lower divorce rates than would be expected for police officers, and that divorce rate varies based on specialty and experience. More experienced police officers are less likely to divorce, as are those working in supervisory roles.

I would provide a link but it was years ago when I read this. I also remember there was some kind of hitch in the data that may have undercounted divorces, but it was consistent across all professions that were part of the data set.

Corrections Officers was listed and it was near the top, along with first-line supervisors.

Firefighters was also listed, it's at the 30% mark, well below the other Protective Services occupations.