WASHINGTON — Those in charge of the nation’s missile defense system have often said the interceptors based at Fort Greely could be used in a pinch. Today, amid reports that North Korea is about to launch a missile capable of reaching the United States, officials wouldn’t say whether that pinch has arrived. “There are many options available, and we are simply not going to tip our hand as to what the possible response would be,” White House spokesman Tony Snow told reporters on a flight to Vienna with President Bush earlier today. Snow’s comments were made to pool reporters traveling...