Why are US soldiers  leaving Chad?

The U.S. has withdrawn its troops from Chad, this follows a similar move in neighbouring Niger. The head of the US Africa Command says it was "temporary repositioning" of troops.  What does he mean and how damaging is this to global security interests?Also why is there growing concern for the safety of children in South Africa?And cyclone Hidaya is expected to make landfall on the East African Coast, affecting mainly the already flooded countries of Tanzania and Kenya.  How prepared are they?Presenter: Richard Kagoe Producers: Charles Gitonga, Bella Hassan, Richard Kagoe and Paul Bakibinga Technical Producer: Jonathan Greer Editors: Alice Muthengi and Andre Lombard