Can the U.S. Military Learn from the War in Ukraine?

At its core, a country’s defense strategy is a very expensive gamble. Every year, the United States spends hundreds of billions of dollars on defense—all on the assumption that such investments will allow it to win the next war. Absent a conflict in which the United States is directly involved, policymakers rarely get a window into whether these bets have actually paid off. One window is when other countries fight a war using U.S. military equipment and tactics—such as the one in Ukraine today. Another example is the 1973 Arab-Israeli War, also known as the Yom Kippur War, when Israel’s near-defeat prompted a thorough reexamination of U.S. weapons and tactics in Washington. Today, Russia’s war once again poses the question whether the United States needs to reexamine the way it prepares for future conflict: not only which weapons it buys, but also how it envisions great-power wars in the 21st century—whether they will be short, sharp affai …