How? Transfer the helicopters from shipping aid and searching for survivors to dumping in untrained members of the public then running food supplies to support them?And in the length of time it takes to do this for all affected areas, what happens to the thousands of people already 5 days in withouth food or safe drinking water, or those who are still buried under rubble.
This should be Japans "all hands call".
No. You use the helicopters for your specialist teams and supplying/moving as many cut off survivors as you can.
At the same time you bulldoze your way up the coast opening communities to road traffic and large numbers of search and support personnel with food, shelter and heating fuel.
At the same time the road builders repair opened and damaged roads to increase traffic capacity.
At the same time all branches of infrastructure engineers move into freshly opened areas restoring supplies.
The problem is not available labour but the logistics of utilising it. Opening and repairing roads is a critical requirement to getting people, supplies and equipment to where they are needed.