This is what it’s like to maintain the US nuclear arsenal

The U.S. will spend more than $750 billion over the next decade to revamp nearly every part of its aging nuclear defenses. Officials say they simply can't wait any longer — some systems and parts are more than 50 years old. The Associated Press was granted rare access to nuclear missile bases and weapons production facilities to see how technicians keep the arsenal working while starting the government's biggest nuclear overhaul since the Cold War.