Lowell C. Pinkerton – Career FSO Title: Ambassador Extraordinary and Plenipotentiary Appointment: April 12, 1956 Presentation of Credentials: May 17, 1956 Termination of Mission: Left post August 25, 1957 James S. Moose, Jr. – Career FSO Title: Ambassador Extraordinary and Plenipotentiary Appointment: March 26, 1958 Presentation of Credentials: April 17, 1958 Termination of Mission: Left post May 5, 1962 William M. Rountree – Career FSO Title: Ambassador Extraordinary and Plenipotentiary Appointment: July 3, 1962 Presentation of Credentials: August 2, 1962 Termination of Mission: Left post September 17, 1965 William H. Weathersby – Career FSO Title: Ambassador Extraordinary and Plenipotentiary Appointment: October 20, 1965 Presentation of Credentials: December 4, 1965 Termination of Mission: Sudan severed diplomatic relations with U.S., June 7, 1967; Weathersby left post June 18, 1967.