Public domain
Chrysler tank arsenal. The firepower is inserted into the upper turret of an M-3 tank. These workers are installing an assembled 37 mm. anti-aircraft gun, which will then be protected by armor plate. Although this gun is designed for anti-aircraft use, it may also be used for straightway firing
From the collection of Library of Congress. Free to download, adapt and use — no permission needed.
Credit lineChrysler tank arsenal. The firepower is inserted into the upper turret of an M-3 tank. These workers are installing an assembled 37 mm. anti-aircraft gun, which will then be protected by armor plate. . 1940-01-01. United States. Office Of War Information, Palmer, Alfred T.. Farm Security Administration/Office of War Information Collection, Library of Congress. Public domain.