[colorado tanker]

The course of the war changed today with the successful test of Fat Man. Little Boy wasn't tested because the scientists knew it would work. And almost no one knew about either one.

[henkster]

That’s an interesting location for a fire watch tower. There doesn’t seem to be any forest for miles around.

[iowamark]

A minor point, but the device in the Trinity test was not called Fat Man, it was "The Gadget." Fat Man was, of course, the Nagasaki bomb. The design was called the Mark III, of which over 100 were eventually produced.

The next US bomb design was the safer Mark IV, which entered service in 1949. It was mass produced at the AEC facility at the Iowa Ordnance Plant in Middletown, Iowa; where my mother worked.