ISIS is grooming child recruits from a young age to be killers for the Islamic State. Charlie D'Agata investigates how hard it is to undo that brainwashing. The story is featured in episode one of "CBSN: On Assignment" a new primetime summer series featuring experiential reports driven by fresh voices and perspectives from around the world. The broadcast will launch Monday, July 31, 2017, (10 p.m. ET/PT) on the CBS Television Network and on CBSN, the network's 24/7 streaming news service.