Chandigarh: Hitting out at Defence Minister Manohar Parrikar, Punjab Congress chief Capt Amarinder Singh on Friday said it was a matter of deep concern that posting of officers at vital operational position were being done on ad hoc basis in the Army, adding that it appeared that the PMO was taking the decision on top-level appointments. Referring to the posting of the General Officer Commanding-in-Chief of Western Command in officiating capacity, he said it had never happened earlier. He said that the posting of the officers on vital positions should be announced well in advance. TNS