(CNBC) US reportedly putting nuclear bombers back on high alert

US reportedly putting nuclear bombers back on high alert
News report claims nuclear bases are being upgraded across the United States
A 24-hour response has not been in place for B-52 bombers since the Cold War

B-52 bombers rigged with nuclear weapons are being prepared for 24-hour alert for the first time since the Cold War, a senior U.S. Air Force official has reportedly said.

In a report by security news website Defense One General David Goldfein, Air Force chief of staff, said U.S. military leaders are reacting to new threat levels.