The Johnson Administration is conducting a review of the entire Viet Nam situation “from A to Z”, the Secretary of State, Mr. Dean Rusk, said here [Washington] to-day [March 11]. Testifying before the Senate Foreign Relations Committee, Mr. Rusk said no specific recommendation for another American troop build-up was before President Johnson at the present time. The entire situation is under consideration from ‘A to Z’ he said. Mr. Rusk added he did not think there was anything more he could say.