6 Nov 1942
United States
United States
- Groves and Oppenheimer visited Los Alamos, New Mexico, United States and agreed that it was suitable as the location for Site Y for the Manhattan Project. ww2dbase [Operation Trinity and Manhattan Project | Los Alamos, New Mexico | CPC]
5 Apr 1944
United States
United States
- At Los Alamos, New Mexico, United States, Emilio Segrè received the first sample of reactor-refined plutonium from Oak Ridge, Tennessee, United States. He would soon discover that the spontaneous fission rate of this plutonium was too high for use in a gun-type fission weapon. ww2dbase [Operation Trinity and Manhattan Project | Los Alamos, New Mexico | CPC]
4 Jul 1944
United States
United States
- J. Robert Oppenheimer revealed Emilio Segrè's final measurements to the Manhattan Project scientists at Los Alamos, New Mexico, which concluded that the "Thin Man" design for a gun-type plutonium weapon was not feasible. ww2dbase [Operation Trinity and Manhattan Project | Los Alamos, New Mexico | CPC]
20 Jul 1944
United States
United States
- The staff at the Los Alamos site of the Manhattan Project shifted focus to work on the implosion mechanism for the atomic bomb. ww2dbase [Operation Trinity and Manhattan Project | Los Alamos, New Mexico | CPC]
10 May 1945
United States
United States
- Manhattan Project Target Committee met at Los Alamos, New Mexico, United States to compile a list of potential atomic weapon targets in Japan. ww2dbase [Atomic Bombing of Hiroshima and Nagasaki | Los Alamos, New Mexico | CPC]
21 Aug 1945
United States
United States
- At Los Alamos, New Mexico, United States, American physicist Harry Daghlian, Jr. of the Manhattan Project accidentally dropped a tungsten carbide brick onto a plutonium bomb core and received a fatal dose of 510 rems of radiation. ww2dbase [Harry Daghlian | Los Alamos, New Mexico | CPC]
15 Sep 1945
United States
United States
- American Manhattan Project physicist Harry Daghlian, Jr., after receiving a fatal dose of radiation during an accident on 21 Aug, died from radiation poisoning in Los Alamos, New Mexico, United States. ww2dbase [Harry Daghlian | Los Alamos, New Mexico | CPC]
16 Oct 1945
United States
United States
- Robert Oppenheimer resigned as the director of the Los Alamos, New Mexico, United States facility of the Manhattan Project. ww2dbase [Operation Trinity and Manhattan Project | Robert Oppenheimer | Los Alamos, New Mexico | CPC]
17 Oct 1945
United States
United States
- Norris Bradbury succeeded Robert Oppenheimer as the director of the Los Alamos, New Mexico, United States facility of the Manhattan Project. ww2dbase [Operation Trinity and Manhattan Project | Los Alamos, New Mexico | CPC]
Please consider supporting us on Patreon. Even $1 per month will go a long way! Thank you. Please help us spread the word: Stay updated with WW2DB: |
Search WW2DB
News
- » Wreck of M-49 Found (10 Apr 2025)
- » Japanese Emperor Visited Iwoto (Iwo Jima) (8 Apr 2025)
- » Race, Holocaust, and African-American WW2 Histories Removed from the US Naval Academy Library (7 Apr 2025)
- » US Government Plans to Purge WW2 Information (17 Mar 2025)
- » See all news
Random Photograph
Soviet troops with captured Japanese field guns, Nomonhan, Mongolia Area, China, Aug 1939Current Site Statistics
- » 1,167 biographies
- » 337 events
- » 44,606 timeline entries
- » 1,243 ships
- » 350 aircraft models
- » 207 vehicle models
- » 376 weapon models
- » 123 historical documents
- » 261 facilities
- » 470 book reviews
- » 28,507 photos
- » 365 maps
Famous WW2 Quote
"The raising of that flag on Suribachi means a Marine Corps for the next 500 years."James Forrestal, Secretary of the Navy, 23 Feb 1945
Support Us

Please consider supporting us on Patreon. Even $1 a month will go a long way. Thank you!

Or, please support us by purchasing some WW2DB merchandise at TeeSpring, Thank you!