Narrated by Hollywood actor Spencer Tracy (Guess Who’s Coming to Dinner, Inherit the Wind, It’s a Mad, Mad, Mad, Mad World, Captains Courageous) this real United States Army recruiting film titled “Ring of Steel” was shot in 1942 by Warner Bros. at a studio in Long Island, New York.

This from Wikipedia:

The film uses stock footage with Tracy’s voice-over narrating the story of America’s military history from the perspective of the personification of the American soldier. The film starts with Lexington and Concord “Where I was born” through the First World War, listing the US military’s achievement and urging young men to sign up.