According to the 'Hollywood Reporter', this movies premiere was held at Camp Campbell (aka Fort Campbell) in Kentucky. This event was included as part of a program to celebrate the 1st Anniversary of the formation of the IV Armored Corps of the Army Ground Forces, United States Army.
Based upon an incident in the Soviet film The Thirteen [See: The Thirteen (1937)] directed by Mikhail Romm and made about six years prior to this movie.
The dog tags held by Gunn at the end are inaccurate. British soldiers wore two dog tags - one circular and one octagonal. These were not made of metal. The circular one was attached to the cord through a hole in the circle, not through an additional loop. The soldier's religious affiliation was shown on the tag as well.
All of the German vehicles are emblazoned with Nazi Party swastikas rather than the Balkenkreuz, the straight-armed cross that was the emblem of the Wehrmacht used on their vehicles during WWII.