Q. How did you prepare for the role [of a former P.O.W. turned war hero who might also be an undercover jihadist in Showtime's “Homeland”]?

A. I investigated post-traumatic stress disorder. I’ve been to a unit where people are suffering from it, and I read a lot of literature. I looked at footage of soldiers in the combat zone. I found “Restrepo” to be unbelievably useful.

--Actor Damian Lewis (“Band of Brothers”) in the Q&A “A World War II Soldier Enters the Post-Iraq Age,” in the Sunday New York Times