 Development of Substitute Materials was otherwise known as?
Atomic Heritage Foundation: The Atomic Heritage Foundation (AHF) is a nonprofit organization in Washington, DC, dedicated to the preservation and interpretation of the Manhattan Project and the Atomic Age and its legacy. Manhattan Project: The Manhattan Project was a research and development undertaking during World War II that produced the first nuclear weapons. Manhattan Project:  The Army component of the project was designated the Manhattan District; "Manhattan" gradually superseded the official codename, Development of Substitute Materials, for the entire project. Manhattan Project:  The Manhattan Project began modestly in 1939, but grew to employ more than 130,000 people and cost nearly US $2 billion (about $ in 2016 dollars).
The Manhattan Project