Challenge upon challenge: as our enemies get more capable, so must we.

THERE is a new sort of war in the Middle East, brought on by the need to engage terrorists on their ground--and by the terrorists' savvy response, which often nullifies Western advantage.

Once the jihadists grasped that America and Israel were no longer content with punitive retaliation, largely by air, but would instead fight to achieve larger political aims by winning hearts and minds, the terrorists changed their tactics. So successful have they been that, after nearly four years in Iraq, the U.S. military cannot secure Baghdad. Saddam is gone, and our ground troops are backed by billions of dollars, the finest air force in civilization's history, ...