I think that's the case.
That’s the way I saw it, watching it live.
In fact, as I’ve posted elsewhere, I — and perhaps the audience — at first thought the soldier was going to complain about the repeal of DADT and ask if the candidates would reinstate it! I took the booing that began as supporting (what seemed to be at first) the soldier’s critical view of the repeal.
Once it became clear that the soldier was on the other side of the issue, things got quiet.
Anyway. As I’ve said, I don’t think anyone should be booed for asking a question that they’ve been invited by the mods to ask in these debates. Just let the questions and answers roll out.