President Barack Obama has deployed American military personnel and drone aircraft to the African country of Niger, where they could be used to support a French counterterrorism mission in neighboring Mali.

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Defense Department officials told NBC News that a first wave will include two Raptor surveillance drones and 250 to 300 military personnel, including remote pilots and security and maintenance crews. They are expected to arrive soon.

The officials stressed that the drones are meant for surveillance only. The White House has faced criticism for a legal memo concluding that the U.S. government can use drones to kill American citizens overseas in certain cases.