called to action. >> he was 11 years old at 9/11. at that time, he decided that that's what i want to do. best kid in the world. couldn't ask for any better. loved his family. his sisters absolutely adored him. >> reporter: the sister of 20-year-old riley mccullom said he was on his first deployment and expecting a baby due in three weeks. another marine 23-year-old sergeant nico agree of sacramento, california posted a week ago on instagram. a photo of her holding an afghan infant. her friend said she cared about people. she loved fiercely. she was a light in the dark world. she was one of two female u.s. service-members among those killed. the other was 25-year-old marine sergeant rosario from massachusetts. >> in a conversation with her mother yesterday, she spoke of