The unexpected death in the spring of Brigadier General Walk, the Chief of Staff, made necessary the assignment of a new Chiefof Staff. This position was filled in the summer by Major General E. McGinley, USA. Captain James R. Pahl, USN, and Colonel Murray A. Bywater, USAF, remained with the Headquarters to serve respectively as the Deputies for Navy and Air Force while Captain W. L. Knickerbocker, USN, continued as the Assistant Chief of Staff (ACofS) for the Logistics Division (J-4). Other ACofS positions were filled by new personnel—the Personnel Division (J-1) by Colonel Robert H. Cushing, Artillery, USA; the Security and Intelli- gence Division (J-2) by Colonel Samuel P. Walker, Armor, USA; the Operations Divisior (J-3) by Colonel William S. Cowart, Jr., USAF; the Communications Division (J-5) by Colonel Francis C. Bowen, Sig- nal Corps, USA; and the Comptroller Division by Colonel Robert C. Davie, Finance Corps, USA. Later, during the on-site operations phase, Rear Admiral H. C. Bruton, USN, the Navy Task Group Commander, served also as the Deputy for Navy thus filling the posi- tion which had been vacant since the middle of the summer as 4 result of the reassignment of Captain Pahl. An overseas test requires much in the way of military support, the estimates for which must be determined as far in advance of forward area operations as possible and must include flexibility so as to cope with additions and changes which inevitably occur. These estimates are incorporated in a study for the consideration and approval of the JCS. The preparation of this study is primarily