Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Representative | State | Training | Title | Appointment | Presentation of Credentials | Termination of Mission | Reason |
| --- | --- | --- | --- | --- | --- | --- | --- |
| Gerald A. Drew | CA | Foreign Service Officer | Envoy | February 2, 1950 | February 24, 1950 | February 25, 1952 | Relinquished charge |
| Joseph C. Green | OH | Non-career appointee | Envoy | May 14, 1952 | July 31, 1952 | 1952 | Promoted |
| Joseph C. Green | OH | Non-career appointee | Ambassador | September 8, 1952 | September 23, 1952 | July 31, 1953 | Appointment terminated |
| Lester D. Mallory | WA | Foreign Service Officer | Ambassador | August 3, 1953 | December 1, 1953 | January 11, 1958 | Relinquished charge |
| Parker T. Hart | IL | Foreign Service Officer | Ambassador | February 5, 1958 | Unknown | Unknown | Unknown |
| Sheldon T. Mills | OR | Foreign Service Officer | Ambassador | February 16, 1959 | March 12, 1959 | March 18, 1961 | Left post |
| William B. Macomber, Jr. | NY | Non-career appointee | Ambassador | March 2, 1961 | April 5, 1961 | December 25, 1963 | Left post |
| Robert G. Barnes | MI | Foreign Service Officer | Ambassador | March 4, 1964 | March 15, 1964 | April 23, 1966 | Relinquished charge |
| Findley Burns, Jr. | FL | Foreign Service Officer | Ambassador | May 10, 1966 | July 23, 1966 | November 5, 1967 | Left post |
| L. Dean Brown | DC | Foreign Service Officer | Ambassador | September 8, 1970 | September 29, 1970 | November 29, 1973 | Left post |
| Thomas R. Pickering | NJ | Foreign Service Officer | Ambassador | February 27, 1974 | March 2, 1974 | July 13, 1978 | Left post |
| Nicholas A. Veliotes | CA | Foreign Service Officer | Ambassador | August 18, 1978 | September 17, 1978 | February 10, 1981 | Left post |
| Richard Noyes Viets | VT | Foreign Service Officer | Ambassador | July 27, 1981 | August 10, 1981 | August 5, 1984 | Left post |
| Paul H. Boeker | OH | Foreign Service Officer | Ambassador | August 13, 1984 | September 1, 1984 | August 13, 1987 | Left post |
| Roscoe Seldon Suddarth | MD | Foreign Service Officer | Ambassador | July 31, 1987 | September 16, 1987 | July 27, 1990 | Left post |
| Roger Gran Harrison | CO | Foreign Service Officer | Ambassador | June 27, 1990 | August 7, 1990 | July 9, 1993 | Left post |
| Wesley William Egan, Jr. | NC | Foreign Service Officer | Ambassador | February 11, 1994 | March 19, 1994 | July 13, 1998 | Left post |
| William Joseph Burns | PA | Foreign Service Officer | Ambassador | June 29, 1998 | August 9, 1998 | June 7, 2001 | Relinquished charge |
| Edward William Gnehm, Jr. | GA | Foreign Service Officer | Ambassador | August 7, 2001 | September 20, 2001 | July 12, 2004 | Left post |
| David Michael Satterfield | VA | Foreign Service Officer | Ambassador | May 12, 2004 | N/A | N/A | N/A |
| David Hale | NJ | Foreign Service Officer | Ambassador | November 2, 2005 | November 7, 2005 | Unknown | Left post |
| Robert S. Beecroft | CA | Foreign Service Officer | Ambassador | July 17, 2008 | Unknown | "Unknown" | Left post |
Question:
Who trained the representative whose presentation of credentials happened on February 24, 1950?
Answer:
Foreign Service Officer