On the DVD audio commentary, David Simon recalled Neal Jones's somewhat unorthodox audition for the role of Sgt. Major Sixta. According to the story, Jones entered the audition room, immediately began screaming his lines unintelligibly - much like his character does - and then walked out of the room without another word. As he opened the door to leave, he winked at casting director Alexa L. Fogel, and she realized she had the right actor for the role.
At the very beginning of the fourth episode, as the camera pans under the truck, a voice off-screen is heard saying, "Hey white boy. What chu waitin for? That hole ain't gonna dig itself. Go on and get your dick skin on that thing boy and dig, dig" This is a line from spoken by Junior in Platoon.
Actors Eric Laden ("Cpl. James Chaffin"), Chance Kelly ("Lt. Col. Stephen 'Godfather' Ferrando"), and Owain Yeoman ("Sgt. Eric Kocher") would once again portray U.S. service members in the Iraq War six years later in the biographical war drama film American Sniper (2014).