Trivia

When the film first went into pre-production it was called "Dead Zone," reflecting the lack of "life" in the zones. To cover up the title of the film, the code name "Delta Zulu" was used. The title "Delta Zulu" is derived from military phonetics, D meaning Delta and Z meaning Zulu. The name stuck and was reworked and re-titled, "Delta Zulu." The varying differences of "Red Zones," "Dead Zones," and "Delta Zulus" are explained in the film.

At the request of Sam Hwang Producer/Technical Adviser, Director Adam Hlavac and Producer Chris Rymer decided to utilize all authentic gear from major Department of Defense manufacturers. Due to the Afghanistan and Iraq war, gear was delayed from manufacturer backlog. Delta Zulu utilized gear from HWI, BDS Tactical, Quantico Tactical Supply, and Night Optics, USA.

Dave Henry of Night Optics, USA worked as the optics consultant for CBS' "The Unit". Night Optics, USA was also used in Steven Spielberg's War of the Worlds (2005). All of the same night vision optics appeared in the action sequences of "Delta Zulu".

Originally conceived as a short film, the producers and directors decided that with the amount of money already in place and with the numerous amount of resources at their disposal they would make the film feature length. Two weeks prior to principal photography, writer Chris Rymer added 20 additional pages to the script for it to be considered feature length by film festival standards.

The directors heavily encouraged improvisation throughout photography to help make it feel like a real documentary.