San Francisco (UP) - Three hundred leaders of the Japanese-American Citizens' league open a three-day session here Sunday to arrange for evacuation of their nationals to "reception centers" to be set up by the western defense command.

These reception centers, probably to be located in Owens valley and the Palo Verde valley near Blythe, will be used for "processing and organizing" thousands of aliens and others who will be excluded from military areas on the Pacific coast.

Formal announcement of the projected move was made Thursday night by Lt.-Gen. John L. DeWitt, commanding the western defense command and the fourth army.

The camps will be established to register evacuees and to determine their capabilities before moving them to permanent locations for duration of the war.

Some, however, may stay at the processing stations for the duration.

DeWitt emphasized evacuation has not yet been ordered, but that specific proclamations will be issued later to effect a progressive evacuation of the five classes of aliens and citizens:

1. Those suspected of sabotage or subversive activity 2. Japanese aliens 3. Japanese-Americans 4. German aliens; 5. Italian aliens

German and Italian aliens who have children in the armed forces of the United States probably will not be required to move.

There will be "no general exclusion of aliens or others from military areas until means have been established to care for their property and to avoid the necessity for forced sales," the army emphasized.

DeWitt said additional prohibited zones from which all Japanese, both aliens and citizens and German and Italian aliens will be excluded, will be announced shortly."