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The on-site workers have left, those who were basically right next to the reactor. There is no indication in any article I have read that they will soon return, only plans of helicopter based fire-fighting or other options.

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They ruled out using helicopters as anything but a last resort in the press conference. They said it was too risky to dump lots of water on the already fragile reactors.

via @W7VOA

"S. Korea to ship boric acid to help Japan stabilize nuclear reactors."

You don't need a helicopter to deliver boric acid into the reactors.

But you need tons of additional water if you deliver it with a helicopter.

And it would seem they have decided to take the risk. NHK reporting Japan self-defense forces are preparing to pour water on Daiichi No. 3 reactor from helicopter.

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