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

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.

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.

October 1942. Assembling switchboxes on the firewalls of B-25 bombers at North American Aviation's Inglewood, California, factory. View full size. 4x5 Kodachrome transparency by Alfred Palmer, Office of War Information.

June 1942. Gas-welding a joint in a line of spiral pipe at the Tennessee Valley Authority's new Douglas Dam on the French Broad River. View full size. 4x5 Kodachrome transparency by Alfred Palmer, Office of War Information.

October 1942. Inglewood, California. North American Aviation drill operator in the control surface department assembling horizontal stabilizer section of an airplane. View full size. 4x5 Kodachrome transparency by Alfred Palmer.

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

October 1942. North American Aviation workers assembling wing component for a P-51 fighter. View full size. 4x5 Kodachrome transparency by Alfred Palmer.

November 1941. Eastern Bessemer converter at Republic Steel in Youngstown, Ohio. Molten iron is charged with air to change it into steel for war essentials. View full size. 4x5 Kodachrome transparency by Alfred Palmer.

June 1942. M-3 tank in action at Fort Knox, Kentucky. View full size. 4x5 Kodachrome transparency by Alfred Palmer, Office of War Information.

November 1941. Blast furnace at Carnegie-Illinois steel mill at Etna, Pennsylvania. View full size. 4x5 Kodachrome transparency by Alfred Palmer.

November 1942. "An American pineapple, of the kind the Axis finds hard to digest, is ready to leave the hand of an infantryman in training at Fort Belvoir, Va." View full size. 4x5 Kodachrome transparency by Alfred Palmer.