Former grunts, what areas of employment have worked out well, and what areas have not? Any suggestions?

Unfortunately when I got out I found that almost nothing in my military experience, no how much sugar coated or polished up, lent itself to civilian occupational fields. Unless you had a particular military specialty that lends itself to the civilian sector you may be better off retraining and reinventing yourself through education and particularly training in a hard marketable skill. Being able to stay cool and solve problems in combat may be a highly regarded quality by the USMC, the typical employer wants to know what your skill and experience are in his particular type of business as he doesn't want to train you on the job on his nickel. While college is nice to get the ticket punched, a degree won't do you much good unless it is in a specific skill field, coupled with entry level experience. Some state jobs will give you partial experience in return for a degree however.

I've been in the agriculture field for 39 years, a little demanding, but keeps me busy.

Law Enforcement has been easier to adapt, before I worked in retail. Hated it. Was always depressed