Coverage of the wars in Ukraine and Gaza is mostly dominated by talk of weapons. Reporters and analysts focus on suicide drones, on shell deficits, on targeting algorithms. But for all the attention devoted to modern weapons and munitions, both conflicts are proving that modern war still comes down to people.... ... Before Covid, fewer than 3 in 10 Americans in the prime recruiting demographic — ages 17 to 24 — were eligible to serve in uniform. Those numbers have shrunk further since the pandemic began. Only 23 percent of young Americans are qualified to enlist without a waiver.... In...