The military parade to mark the U.S. Army’s 250th anniversary and its convergence with U.S. President Donald Trump’s 79th birthday are combining to create a peacetime outlier in U.S. history. Yet it still reflects global traditions that serve a range of political and cultural purposes. Variations on the theme have surfaced among longtime NATO allies in Europe, one-party and authoritarian states and history’s darkest regimes. France: Bastille Day and Trump’s idée inspirée The oldest democratic ally of the U.S. holds a military parade each July 14 to commemorate one of the seminal moments of the French Revolution. It inspired —...