Less than a month into the Libyan conflict, NATO is running short of precision bombs, highlighting the limitations of Britain, France and other European countries in sustaining even a relatively small military action over an extended period of time, according to senior NATO and U.S. officials.

The shortage of European munitions, along with the limited number of aircraft available, has raised doubts among some officials about whether the United States can continue to avoid returning to the air campaign if Libyan leader Moammar Gaddafi hangs on to power for several more months. . .