June 1942. Electrical transformer at the TVA Chickamauga Dam near Chattanooga. View full size. 4x5 Kodachrome transparency by Alfred Palmer.

June 1942. "Generator hall of the Chickamauga Dam powerhouse near Chattanooga, Tenn." 4x5 inch Kodachrome transparency by Alfred Palmer. View full size.

October 1942. P-51 "Mustang" fighter planes being prepared for test flight near the North American Aviation plant in Inglewood, California. View full size. 4x5 Kodachrome transparency by Alfred Palmer for the Office of War Information.

"The floating folds of the Star Spangled Banner symbolize the American way of life to soldiers in training for the battles that will bring freedom to an unhappy, wartorn world." Fort Knox, Kentucky, June 1942. View full size. 4x5 Kodachrome transparency by Alfred Palmer.

June 1942. Combustion Engineering maintenance man working on world's largest cold steel hydraulic press in Chattanooga. It can shape steel plates several inches in thickness. View full size. 4x5 Kodachrome transparency by Alfred Palmer.

June 1942. Checking the alignment of a turbine shaft at the top of the guide bearing in the TVA hydroelectric plant at Watts Bar Dam, Tennessee. View full size. 4x5 Kodachrome transparency by Alfred Palmer.

July 1942. Servicing an A-20 bomber at Langley Field, Virginia. View full size. 4x5 Kodachrome transparency by Alfred Palmer.

June 1942. Tank commander at Fort Knox, Kentucky. View full size. 4x5 Kodachrome transparency by Alfred Palmer.

"Noontime rest for a full-fledged assembly worker at the Long Beach, Calif., plant of Douglas Aircraft Company." October 1942. View full size. 4x5 Kodachrome transparency by Alfred Palmer for the Office of War Information.

Touching up the U.S. Army Air Forces insignia on a "Vengeance" dive bomber manufactured at Consolidated-Vultee's Nashville division. February 1943. View full size. 4x5 Kodachrome transparency by Alfred Palmer.

February 1943. "Capping and inspecting tubing that goes into the manufacture of the 'Vengeance' A-31 dive bomber made at Consolidated-Vultee's Nashville division." 4x5 Kodachrome transparency by Alfred Palmer. View full size.

October 1942. P-51 "Mustang" fighter in flight near the Inglewood, California, plant of North American Aviation. 4x5 Kodachrome transparency by Alfred Palmer. View full size.

June 1942. "Big Pete" Ramagos, a rigger at work on the TVA's Douglas Dam in Tennessee. View full size. 4x5 Kodachrome transparency by Alfred Palmer.

Preparing a model of the B-25 bomber for the wind tunnel at North American Aviation's plant at Inglewood, California. October 1942. The model maker holds an exact miniature reproduction of the type of bomb the plane will carry. View full size. 4x5 Kodachrome transparency by Alfred Palmer.

June 1942. Truck driver at the Tennessee Valley Authority's Douglas Dam. View full size. Amazing 4x5 Kodachrome transparency by Alfred Palmer.