The Tanks Are Coming is a 1941 American Technicolor short film directed by B. Reeves Eason and written by Owen Crump.
Like Dive Bomber (of the same year) it is a pre-Pearl Harbor film, made with the co-operation of the relevant branch of the US armed forces, showing off US military material to the US public, in lavish Technicolor.
This material is shown in motion, both on the road and in the field; training equipment and methods are also featured.
[1] New York taxicab driver Malowski (George Tobias) enlists in the "First Armored Force", bringing his beloved taxi cab "Betsy" with him.
A young Richard Egan appears uncredited in a few scenes and has a few lines.