The Manhattan Project represents one of the largest military projects in U.S. history. Yet, when it started, nobody knew it by that name — not even the plethora of influential scientists who traveled to New Mexico from all over the world to work on it.
They knew the project simply as “Project Y” — a secretive codename for an effort carrying out even more secretive work.
Secrecy extended past the name of the project itself. Military chiefs needed a spot to handle some of the most advanced research…
Source: The Business Journal