As the DB suggests, this isn't terribly surprising since numerous Republican national security experts have already signed public letters saying they would never serve a President Trump.
On the one hand, it is gratifying and honorable to say these things. And I certainly understand people not wanting to compromise themselves. You may feel a certain sense of "Sucks to be them" when seeing they're having difficulty on this front.
But it's important to remember: someone will fill those positions. If they can't get trained people they'll get the kind of fringe people who Trump had in his orbit during the campaign. That won't be a good thing. No option here is going to be a good thing. But that will be an especially bad thing.