The United States enters World War II after the Japanese attack on Pearl Harbor, marking full American involvement in the global conflict.
The United States establishes the Eighth Air Force, responsible for daylight strategic bombing operations over Nazi-occupied Europe.
Allied strategic bombing campaign targets German military and industrial facilities to weaken Germany's war capacity, the backdrop for many missions depicted in Twelve O'Clock High.
The B-17 bomber becomes a key aircraft for the U.S. Army Air Forces' strategic bombing efforts over Europe, featured prominently in Twelve O'Clock High.
The movie 'Twelve O'Clock High' is released, depicting the challenges and heroism of American bomber crews during World War II.
Brigadier General Frank Savage arrives to take command of the 918th Bomb Group, which has had poor morale and performance.
The 918th Bomb Group undertakes its first mission under General Savage's strict leadership, experiencing heavy losses but showing improved discipline.
Captain Davenport is promoted through the ranks for his leadership during combat missions.
The 918th completes several combat missions with increasing success but at high casualty rates.
Under constant pressure of command and stress from war losses, General Savage suffers a breakdown and is relieved from command.
After recovery, General Savage rejoins the group for a final decisive mission.
