Hamas’s shocking attack was the largest incursion into Israel since the 1973 Yom Kippur War. Lessons from that conflict shaped modern U.S. defense, and Israel’s next war could have similar effects on American military thought. While the ripples of what some are calling Israel’s 9/11 remain to be seen, there is no doubt that the world will be plunged into a period of instability that should concern all Americans, especially as the war in Ukraine rages on. Since Russia’s February 2022 invasion of Ukraine, the Western market for lessons learned has been booming. A torrent of such commentary began only...