Which military weapon was constructed as part of the government program known as the Manhattan Project?

The primary military weapon constructed as part of the Manhattan Project was the atomic bomb. This top-secret project, initiated during World War II, aimed to develop nuclear weapons to counter the Axis powers. The first successful test of an atomic bomb, known as the Trinity test, occurred on July 16, 1945, in New Mexico, leading to the subsequent bombings of Hiroshima and Nagasaki in August 1945.