June 1942. An M-4 tank crew training at Fort Knox, Kentucky. View full size. 4x5 Kodachrome transparency by Alfred Palmer, Office of War Information.

June 1942. Boiler welder at Combustion Engineering in Chattanooga, Tennessee. View full size. 4x5 Kodachrome transparency by Alfred Palmer.

October 1942. "American mothers and sisters, like these women at the Douglas Aircraft Company plant in Long Beach, California, give important help in producing dependable planes for their men at the front." View full size. 4x5 Kodachrome transparency by Alfred Palmer for the Office of War Information.

May 1942. Marines training in barrage balloon technique at Parris Island, South Carolina. View full size. 4x5 Kodachrome transparency by Alfred Palmer.

January 1943. Indiana Harbor Belt switch engine near Calumet Park stockyards at Calumet City, Ill. View full size. 4x5 Kodachrome transparency by Jack Delano.

December 1942. A winter afternoon in the North Proviso yardmaster's office, Chicago & North Western Railroad. View full size. 4x5 Kodachrome transparency by Jack Delano. Click here for a closeup of the poster on the wall.

December 1942. Proviso classification yard of the Chicago & North Western Railroad. View full size. 4x5 Kodachrome transparency by Jack Delano.

June 1942. Tightening a nut on a guide vane servomotor in the Tennessee Valley Authority hydroelectric plant at the Watts Bar Dam. View full size. 4x5 Kodachrome transparency by Alfred Palmer, Office of War Information.

October 1942. Bomb bay gasoline tanks for long-range flights by B-25 bombers await installation at the North American Aviation plant in Inglewood, California. View full size. 4x5 Kodachrome transparency by Alfred Palmer.

October 1942. Workers installing fixtures and assemblies in the tail section of a B-17F bomber at the Douglas Aircraft Company plant in Long Beach, California. View full size. 4x5 Kodachrome transparency by Alfred Palmer.

March 1943. The giant Santa Fe Elevator near Kansas City, demolished in the 1990s, held 10 million bushels of grain. View full size. 4x5 Kodachrome transparency by Jack Delano, Farm Security Administration/OWI.

April 1943. A.S. Gerdee of 3251 Maypole Street, Chicago, a switchman at the Proviso Yard of the Chicago & North Western Railroad. View full size. 4x5 Kodachrome transparency by Jack Delano, Office of War Information.

December 1941. Along the waterfront of Christiansted, Saint Croix, in the Virgin Islands. View full size. 4x5 Kodachrome transparency by Jack Delano.

November 1941. Iron ore piles and blast furnaces of the Carnegie-Illinois steel mill in Etna, Pennsylvania. View full size. 4x5 Kodachrome transparency by Alfred Palmer for the Office of War Information.

October 1942. "Clerk in North American Aviation stockroom, checking to see if the proper numbers of parts were received and placed in the proper bin. Inglewood, California. This plant produces the battle-tested B-25 (Billy Mitchell) bomber, used in General Doolittle's raid on Tokyo, and the P-51 (Mustang) fighter plane which was first brought into prominence by the British raid on Dieppe." View full size. 4x5 Kodachrome transparency by Alfred Palmer.