Instructions: In this task, you're given a context, further information available on a particular linked term from the statement, and an answer term. Your job is to generate a question that can use the information provided to obtain the given answer. You should use the information on both context and link information to create the question. Note that the answer to the question should be exactly the given answer, and if the answer is none, the answer to the question shouldn't be obtainable from the context or linked information.
Input: Context: In June 1943, the head of the British Special Operations Executive mission in Greece, Brigadier Eddie Myers, conceived the Agreement of National Groups. Link Information: From October 1942 to early 1944, brevetted first to Colonel and then to Brigadier, he headed the SOE-controlled British Military Mission to occupied Greece. Answer: October 1942
Output:
When die the person who was the the head of the British Special Operations Executive mission in Greece in 1943 first achieve his position?