Joe (a soldier in the Korean War) using a Lee Enfield .303 rifle. But this was a British weapon and would not have been issued to US forces. We also see that he is a member of the US Special Forces, the Green Berets but they were never deployed to Korea and would not have had any Afro-American soldiers at this point as they were still segregated.
During the flashback where Earl steals the RV, a 2008 Ford RV is seen. Assuming Earl started the list in 2005, a 2008 model doesn't belong in a flashback before 2005.