By Jeff Stein, CQ National Security Editor
Forty years ago, Sgt. Silvestre Reyes was a helicopter crew chief flying dangerous combat missions in South Vietnam from the top of a soaring rocky outcrop near the sea called Marble Mountain.

After the war, it turned out that the communist Viet Cong had tunneled into the hill and built a combat hospital right beneath the skids of Reyes- UH-1 Huey gunship.

Now the five-term Texas Democrat, 62, is facing similar unpleasant surprises about the enemy, this time as the incoming chairman of the House Intelligence Committee.

That’s because, like a number of his colleagues and top counterterrorism officials that I-ve interviewed over the past several months, Reyes can-t answer some fundamental questions about the powerful forces arrayed against us in the Middle East.

It begs the question, of course: How can the Intelligence Committee do effective oversight of U.S. spy agencies when its leaders don-t know basics about the battlefield?

To his credit, Reyes, a kindly, thoughtful man who also sits on the Armed Service Committee, does see the undertows drawing the region into chaos.

For example, he knows that the 1,400- year-old split in Islam between Sunnis and Shiites not only fuels the militias and death squads in Iraq, it drives the competition for supremacy across the Middle East between Shiite Iran and Sunni Saudi Arabia.

That’s more than two key Republicans on the Intelligence Committee knew when I interviewed them last summer. Rep. Jo Ann Davis, R-Va., and Terry Everett, R-Ala., both back for another term, were flummoxed by such basic questions, as were several top counterterrorism officials at the FBI.

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