April 16, 1953: "Factors Involved in the Overthrow of Mossadeq" was completed. April 1953: It is decided that "CIA should conduct the envisioned operation jointly with the British Secret Intelligence Service."[59] June 3, 1953: US Ambassador Loy Wesley Henderson arrives in the United States and is consulted regarding the "CIA's intention to design covert means of achieving the objective and aims" June 10, 1953: The plan is completed.