Joseph B. Keenan Leaves for U. S. Carlisle Higgins to Take His Place During Absence Joseph B. Keenan, chief prosecutor of the International Prosecution Section, yesterday left by plane for the United States on official business in connection with the Tokyo war crimes trials. Length of his stay in the United States is undetermined. In his absence, Carlisle W. Higgins of Winston-Salem, N. C., will take his place at the prosecution table. Testimony is scheduled to begin Thursday. Mr. Higgins, former U. S. attorney for the Middle District of North Carolina, was an original member of the Keenan party when it came to Tokyo and has been serving as the chief prosecutors’ executive officer.