Deactivation On 7 February 2006, nearly one year to the day after Secretary Rumsfeld’s memorandum, Det One got the official word on its fate. Captain Daniel B. Sheehan III forwarded a message to the author with the comment, “There you have it. The fat lady sang.” Attached to his e-mail was the full text of Marine Corps Bulletin 5400, dated 6 February 2006. It directed the deactivation of MCSOCom Detachment no later than 1 April 2006 and laid out the subordinate tasks in detail. The manpower structure that was shuffled to create the billets for the detachment would be reshuffled to return each of the slots to the 42 commands from which they had come.