| 2026-05-03 | Org. for J. Robert Oppenheimer |
| 2022-02-25 | Post-Manhattan Project org. |
| 2019-08-06 | Early nuclear org. |
| 2019-06-16 | Agcy. created after the Manhattan Project |
| 2018-08-19 | Old nuclear agcy. |
| 2017-07-23 | Agcy. that oversaw plants |
| 2014-11-16 | Org. replaced by the N.R.C. |
| 2014-07-16 | Early nuclear org. |
| 2014-01-18 | Oppenheimer's agcy. |
| 2013-11-24 | N.R.C. forerunner |
| 2013-05-18 | Post-W.W. II fed. agcy. |
| 2013-01-14 | Nuclear agency established by H.S.T. |
| 2012-12-06 | Federal agcy. of 1946-75 |
| 2012-08-15 | Early nuclear org. |
| 2012-02-21 | Old nuclear regulatory org. |
| 2011-11-14 | Old nuclear regulatory org. |
| 2011-02-27 | Old nuclear watchdog: Abbr. |
| 2010-09-11 | Post-Manhattan Project org. |
| 2010-04-16 | Post-Manhattan Project agcy. |
| 2009-11-08 | Original nuclear regulatory grp. |
| 2008-10-08 | Former govt. agcy. formed after W.W. II |
| 2008-07-04 | N.R.C. predecessor |
| 2008-01-16 | N.R.C. forerunner |
| 2006-12-16 | Post-Manhattan Project org. |
| 2006-09-17 | N.R.C. forerunner |
| 2006-02-26 | Agcy. once involved with fallout shelters |
| 2006-01-29 | Agcy. spawned by the Manhattan Project |
| 2005-12-01 | Post-Manhattan Project org. |
| 2005-08-14 | Bygone nuclear agcy. |
| 2005-05-27 | Nuclear agcy. until 1975 |
| 2004-03-14 | Old nuclear regulatory org. |
| 2003-09-29 | N.R.C. predecessor |
| 2002-09-29 | Agcy. created after the Manhattan Project |
| 2002-08-18 | Agcy. replaced by the N.R.C. |
| 2001-09-16 | Former regulatory org. |
| 2001-03-29 | Former nuclear power org. |
| 1999-05-23 | Truman's nuclear agcy. |
| 1998-11-13 | Federal agcy., 1946-75 |
| 1998-06-09 | Truman's nuclear agcy. |
| 1998-05-31 | N.R.C. predecessor |
| 1997-06-26 | Grp. overseeing early reactors |
| 1997-06-15 | Federal agcy., 1946-75 |
| 1996-04-14 | N.R.C. forerunner |
| 1996-02-17 | N.R.C. predecessor |
| 1995-12-17 | Early nuclear org. |
| 1995-01-14 | Former nuclear power agcy. |
| 1994-06-19 | Org. once headed by Lewis Strauss |
| 1994-02-24 | Former nuclear agcy. |