Editing Trinity (nuclear test) (section)

===Organization===
In March 1944, planning for the test was assigned to [[Kenneth Bainbridge]], a professor of physics at [[Harvard University]], working under explosives expert [[George Kistiakowsky]]. Bainbridge's group was known as the E-9 (Explosives Development) Group.{{sfn|Hawkins|Truslow|Smith|1961|p=266}} Stanley Kershaw, formerly from the [[National Safety Council]], was made responsible for safety.{{sfn|Hawkins|Truslow|Smith|1961|p=266}} [[Captain (United States O-3)|Captain]] Samuel P. Davalos, the assistant post engineer at Los Alamos, was placed in charge of construction.{{sfn|Jones|1985|p=478}} [[First Lieutenant]] Harold C. Bush became commander of the Base Camp at Trinity.{{sfn|Bainbridge|1976|p=4}} Scientists [[William Penney]], [[Victor Weisskopf]] and [[Philip Burton Moon|Philip Moon]] were consultants. Eventually seven subgroups were formed:{{sfn|Hawkins|Truslow|Smith|1961|pp=269–270}}
* TR-1 (Services) under [[John Harry Williams|John H. Williams]]
* TR-2 (Shock and Blast) under [[John Henry Manley|John H. Manley]]
* TR-3 (Measurements) under [[Robert R. Wilson]]
* TR-4 (Meteorology) under J. M. Hubbard
* TR-5 (Spectrographic and Photographic) under Julian E. Mack
* TR-6 (Airborne Measurements) under [[Bernard Waldman]]
* TR-7 (Medical) under [[Louis Hempelmann|Louis H. Hempelmann]]

The E-9 group was renamed the X-2 (Development, Engineering and Tests) Group in the August 1944 reorganization.{{sfn|Hawkins|Truslow|Smith|1961|p=266}}