I'm pretty sure the bunker inside is fine. Outside might be a bit more irradiated than the rest of the wasteland, but seeing as there are ponies outside being all casual, I don't think that's much of an issue either.
Probably not very pleasant to sit in that little pillbox near the crater though.
If you click on download it'll get you a bigger resolution. The ones at the bunker entrance are doing pushups while being watched by I presume a drill instructor, and there's a few just standing around.
Oh for sure. Then there's the question of who are these ponies? Leftovers from the Equestrian Army that somehow managed to survive the bombs dropping? A military faction that got their hooves on Army uniforms? I like this idea, makes the gears in your head turn a bit. And just from a picture too