Some might question the presence of beards and a lack of uniform devices on the soldiers as a factual error. However, this could theoretically be explained as inactive ready reserve members, or veterans being activated to provide additional manpower in the face of overwhelming need. Additionally, the Army does not wear the collar fastened, except in extreme cold weather, however, it could be fastened in a protective measure against zombie bites.
Showrunner John Hyams is the son of veteran filmmaker, Peter Hyams, director of 2010 (1984), The Star Chamber (1983), Outland (1981) and Capricorn One (1977).