"We Stand Alone Together" is a documentary revealing a number of interviews from the original veterans from Band of Brothers that we see in the series, but also some that we didn't see. It's a fantastic documentary. You should check it out.
Also, I hope you get the opportunity to check out Tom Hanks' and Steven Spielberg's series "The Pacific" as well. It's quite different from Band of Brothers, but obviously that's because of different circumstances. You may also recognize some actors in that series as well if you do choose to see it.