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The Chief of the Army Staff (COAS), formerly called the Commander in Chief (C in C), is charged with the responsibility of commanding the Pakistan Army. The COAS operates from army headquarters in Rawalpindi, near Islamabad. The Principal Staff Officers (PSO's) assisting him in his duties at the Lieutenant General level include a Chief of General Staff (CGS), under whom the Military Operations and Intelligence Directorates function; the Chief of Logistics Staff (CLS); the Adjutant General (AG); the Quarter-Master General (QMG); the Inspector General of Training and Evaluation (IGT&E); and the Military Secretary (MS). A major reorganization in GHQ was done in September 2008 under General Ashfaq Parvez Kayani, when two new PSO positions were introduced: the Inspector General Arms and the Inspector General Communications and IT, thus raising the number of PSO's to eight.[24].
The headquarters function also includes the Judge Advocate General (JAG), and the Comptroller of Civilian Personnel, the Chief of the Corps of Engineers (E-in-C) who is also head of Military Engineering Service (MES), all of them also report to the Chief of the Army Staff.