Mattis has been sharply critical of President Barack Obama's policies on Iran and Obama's capping of troop numbers and campaign end-dates in theaters of war such as Afghanistan and Iraq. Mattis also appears to be a skeptic of the Obama-era policy of putting women into combat roles.

The senior director at the NSC for the Middle East is retired Col. Derek Harvey, an Arabic-speaking intelligence officer with a Ph.D. who served as the head of the U.S. military cell examining the insurgency in Iraq in 2003.

An intelligence officer and historian, Rayburn published a 2014 book, 'Iraq After America,' which is a must-read for anyone who wants to understand how Iraq descended into chaos in the years after the American troop withdrawal at the end of 2011.

The hard reality is that attacks by vehicles in public places are very hard to defend against in a free and open society. The best defense against such attacks is good intelligence, and that often comes from inside the Muslim community.

Each instant of life is a step toward death.

Grief is only the memory of widowed affections.

Of all the logical impasses, unknowings, paradoxes, and terrors that provoke laughter, death by its finality and unsolvable mystery is paramount.

Shallowness and ignorance have been our lot in the mass consumer societies we inhabit, where we were too distracted to act politically, apart from periodically deputing political elites to take life-and-death decisions on our behalf.