fallen here. 46-year-old sergeant williams rivers, a 134-year veteran. 23-year-old specialist briana moffat. her mother said she always lit up a room. and 24-year-old specialist kennedy sanders, described as having a big smile and a big heart. tonight, how will the u.s. respond? abc's chief global affairs correspondent martha raddatz leading us off tonight. >> reporter: tonight, new details on that brazen drone attack that killed three american soldiers and wounded more than 40 others at tower 22, a remote u.s. base in the jordanian desert. the pentagon saying those soldiers, many army reservists from an engineering unit, were asleep in their beds early sunday morning, when an explosive-laden drone slammed into their barracks. tragically, officials telling abc news that initial reports indicate no one tried to shoot down the enemy drone, mistakenly believing it was a u.s. surveillance drone, one of their own. late today, the pentagon revealing the identities of those fallen soldiers, including -- 46-year-old sergeant william rivers, a 13-year veteran. 23-year-old specialist breonna moffett,