At the dawn of the Cold War, a simple phrase defined America’s national security strategy: “Peace through strength.” Today, 75 years later, the world faces similarly severe challenges, but this time the United States is struggling to adopt and actualize a similarly decisive policy. 
A pair of Russian strategic bombers flew near U.S. and Canadian airspace last week before turning back short of the countries’ Air Defense Identification Zone, the head of North American Aerospace Defense Command and U.S. Northern Command revealed March 14. Air Force Gen. Gregory M. ...