Has anyone read the methodology?
http://www.careercast.com/jobs-rated/jobs-rated-2013-methodo...
Looks like they made up some list of things they think should be stressful, gave them arbitrary point values, and scored each occupation.
The authors of the study are CareerCast.com. Not exactly an authority.
No doubt, being a soldier or a firefighter has got to be stressful. But this "study" won't prove it.