There are a number of nations that are still participating in the mission.
Let me address the comment about whether the skies are completely safe.
What you have is an evolving situation. During the first couple of nights there were, as you know, a number of Tomahawk land attack missiles fired by other countries to take out some of the ground anti-air equipment. Some of that equipment has indeed been neutralized. But we don't have personnel on the ground. So we need to continue to watch the situation and see what happens--whether radars can come back online; whether they're repaired by the Libyans and then begin to pose a threat again. Sometimes it may be that you've taken out a radar, but you may not have taken out the missile system itself. If they can repair the radar, then that system may become dangerous again. There are a number of mobile systems, as well, that the Libyans have.
While it may be fair to say that we're in good shape at the moment in terms of control of the skies, that could change at any time. So we need to be prepared for that.
When it comes to the protection of the population, as I say, of course, that's the mission we essentially did earlier today when we engaged an ammunition depot that was resupplying. There are others that are doing that particular mission as well. They are engaging in activities that would protect the population, as you noted, under article 4 of resolution 1973.