Rageh Omaar, Al-Jazeera International, investigates the US' military and political strategy for Africa and how its relationship with the continent may change under US president Obama. The first part of the documentary (Witness - America's New Frontline) can be seen from Sunday, September 20; and the second part airs from Sunday, September 27. US Africa Command (USAFRICOM) cooperated with Al-Jazeera, in the filming of this documentary.