NATO Communications and Information Systems Services Agency Command, Control, Communications, Intelligence, Surveillance and Reconnaissance (C4ISR) capabilities. The Director of NCSA was accountable to NATO's Consultation, Command and Control Board for executing the general policy decisions, directives and strategy associated with providing CIS services throughout NATO. The Director was also accountable to the Supreme Allied Commander Europe (SACEUR) for all operational, or deployed, CIS assets. In 2007, Canadian Forces internet sources said that NCSA comprised a central headquarters staff co-located with Allied Command Operations at the Supreme Headquarters Allied Powers Europe in Mons, Belgium; two deployable NATO Signal Battalions, each with four deployable communication modules, comparable in size
Supreme Headquarters Allied Expeditionary Force to this day. Southwick House was used as an alternative headquarters near Portsmouth. Its staff took the outline plan for Operation Overlord created by Lieutenant General Sir Frederick E. Morgan, Chief of Staff to the Supreme Allied Commander (Designate) (COSSAC), and Major General Ray Barker. Morgan, who had been appointed chief of staff to the Supreme Allied Commander (designate) in mid-March 1943 began planning for the invasion of Europe before Eisenhower's appointment. and moulded the plan into the final version, which was executed on 6 June 1944. That process was shaped by Eisenhower and the land forces commander for the