It’s tactically smart. Obama can’t play him off as a neophyte who just wants to get us into more wars.
Make O look like the guy who just takes credit for killing people as if that fixes the entire problem.
Mitt needs to be a little wonkish on foreign policy to undercut O’s criticism of his inexperience.
Mitt did well with that very thing just minutes ago (FR too slow to keep up!)
Side note: Mitt's voice is easier to hear than Obama's for some reason. I think it's the natural tone and timbre of his voice. It comes through the audio ten times better than Obama's. He sounds definite, sparkling, and clear, compared to Obama, who sounds murky, dark, and muffled.