Calculating the Risks in Pakistan A small group of U.S. military experts and intelligence officials convened in Washington for a classified war game last year, exploring strategies for securing Pakistan's nuclear arsenal if the country's political institutions and military safeguards began to fall apart. The secret exercise — conducted without official sponsorship from any government agency, apparently due to the sensitivity of its subject — was one of several such games the U.S. government has conducted in recent years examining various options and scenarios for Pakistan's nuclear weapons: How many troops might be required for a military intervention in...