The other day on ERE they had an announcement of another job site for veterans. Recently a site here in Connecticut got funding called Combat2Careers. These join a long line of military/veteran job boards already out there.
Though their goal is a noble one, I think there may be too many of these sites to make them all viable business opportunities. I’m sure some of these are non-profit type entities and some may even be more localized programs. But if you are planning to go up against the bigger sites like VetJobs or Military.com you will face a long uphill battle.
It’s a crowded niche to get into. Having said that, there may be “sub-niches” you can target such as ones with a local focus (ex. “Hire Florida Vets”) or specialty (ex. “Ex-military pilots”).