The story mentioned several cases of questionable assocations.
But since its a WND story, we should probably be talking about this in terms of hypotheticals.
Sure, let's say a hypothetical American citizen converts to Islam and hypothetically joins the Army. A hypothetical war breaks out with Islamic terrorists and supporting regimes. The soldier is hypothetically sent to an Islamic country where he hypothetically murders fellow American officers. You get wind of this hypothetical story in the media for a few days or weeks and it is hypothetically buried.
Now back to this hypothetical FBI story reported by WND. People with personal experience or knowledge of classified information are covered under various statutes and oaths. They will not usually tell you things like this. Sometimes the topic may leak in the context of some hypothetical FBI whistleblower case, at least until some hypothetical Federal judge rules the information should not be made public.
I believe we should be very concerned about bias and incompetence in the agencies. A word to the wise is often sufficient.