question: What was the most significant military conflict in shaping the evolution of military institutions in the 20th century? Choose from the following: ('World War I', 'World War II', 'Cold War') -- please include the exact phrase in your response.
answer: The most significant military conflict in shaping the evolution of military institutions in the 20th century was "World War II." This conflict led to major advancements in technology, strategy, and the establishment of military alliances that significantly influenced global military institutions.