I suspect Episode 29 (1-20-12) was the final episode...
The reason I say this is Mykel's narration/voiceover at the end of the show, where he talks about how far his wife has come during these adventures, how he wasn't sure she could make it in the beginning, but that she's proven him wrong time and again and he's comfortable she could survive on her own if she had to, now, etc. (and this brief -- maybe a minute, or less -- voiceover runs while they show clips of the couple from previous shows.
Also, the show isn't scheduled for next week, so I'm guessing at the very least this was the end of this season. Frankly, I didn't expect a third season, and was kind of surprised when it came back for one. But I'm thinking they've just about exhausted the number and variety of different scenarios they can present for this type of show, and she may want to get back to spending more time as mom, or at least less time freezing/going hungry/thirsty for a TV show.
I'm not certain how well "One-Man Army" did. I sort of enjoyed it, although that was pretty much in spite of Mykel Hawke, who I thought came off as pretty arrogant on that show. I mention this simply because if it's not renewed, and they've finished this show, he's out of a job. But who knows, maybe they've been saving their pennies?
My guess is that Myke could probably get any of a number of jobs as a security consultant or trainer, having been a Captain in the Airborne Rangers, so I doubt money is a worry for them. But once you're "famous" on TV, the allure of that may be hard to give up.
Jeff Hayes