david, i apologize, i can't remember what book that is. we've covered some books on this topic including margot lee shetterly's "hidden figures," ney that would ya holt's "rocket girls." let's try michael in beechwood, ohio. you're on booktv from the tucson festival of books with author liza mundy, and we are listening. >> caller: hi, liza, this is michael, and i hope you can understand me all right. i'm a 30-year veteran of one of the service crypt logic agencies from the middle '60s until i retired in the mid '90s. >> guest: thank you for your service. >> caller: thank you. thank you for your book. [laughter] one brief question, then i'll go on. the women and men who were working on the yamamoto schedule, were they in op 20-g? were they part of the navy? >> guest: yes. yes, navy. uh-huh. >> caller: okay. i've heard the stories of the women in world war ii, and naval security, they were told if they everst said anything, they'd be shot. >> guest: exactly, you got it. >> caller: well, they didn't tell us we'd be shot. [laughter] none of us, we took our oath seriously, and i was president of the northern ohio chapter of the association of former intelli