As it happens, my Dad worked for Luis Alvarez (Nobel, Physics '68) at Lawrence Berkeley Lab (née the Radiation Lab) back in the 1960s - and I know his younger son. Alvarez worked on the Manhattan Project largely on the capacitors for the explosives on the implosion device, was at Trinity, and a few weeks later was on The Great Artiste, one of the chase planes with Enola Gay.

So I grew up with lots of stories about Manhattan Project-adjacent people and met more than a few, but I've ways been partial to these two letters written by Alvarez. The first was to his then-young son Walter on his way back to Tinian.

https://iowaculture.gov/history/education/educator-resources/primary-source-sets/world-war-ii/letter-dr-luis-alvarez-to-his

The other is a letter he wrote which was dropped over Nagasaki in an effort to make sure the physics community in Japan knew what had happened to them and how.

https://lettersofnote.com/2009/12/14/this-rain-of-atomic-bombs-will-increase-manyfold-in-fury/

Anyway, I searched his sub and didn't see any mention of Alvarez and if there's anyone that had missed these before, I wanted to make sure you knew of them.