The Loneliest Job" Nancy Gibbs - Time Jan 25 2010.

Eisenhower recalled how as a general, before D-Day, he had to decide whether to send two paratroop divisions into a sector where 9 out of 10 would probably be slaughtered. He eventually decided the troops were essential to the mission and said, "I felt that only once in a lifetime could a problem of that sort weigh as heavily on a man's mind and heart". Then he became President and found a comparable burden :

"when one man must conscientiously, deliberately, prayerfully scrutinize every argument, every proposal, every prediction, every alternative, every probable outcome of his action, and then-all alone-make his decision. "