This “review of reviews” looks at how and what Western governments and international organizations have tried to learn from the intervention in Afghanistan. The fundamental lesson drawn is a warning: “Never say never.” While the era of massive intervention may be over, many of the same flaws that marred Western policy in Afghanistan remain relevant in Ukraine and elsewhere. The reviews offer a wealth of lessons on setting and adapting realistic goals and strategies, using and producing knowledge, dealing with (il)legitimate government, and coordinating domestic and international actors.