| Number | Begin | End | Name |
| 32 | December 2020 | | Seth T. Waters |
| 31 | December 2019 | December 2020 | Ethan C. Gibson |
| 30 | December 2018 | December 2019 | Teddy Hadden |
| 29 | January 2017 | December 2018 | Joel R. Snider |
| 28 | November 2016 | January 2017 | Brad A. Kostensky |
| 27 | December 2015 | November 2016 | Derrick S. Ramage |
| 26 | January 2015 | December 2015 | Juho E. Lepparanta |
| 25 | September 2013 | January 2015 | Garrett J. Manley |
| 24 | August 2010 | May 2011 | Joshua P. Franz |
| 23 | January 2009 | August 2010 | Kristopher O'Hare |
| 22 | February 2008 | January 2009 | Stephen Derengowski |
| 21 | November 2006 | February 2008 | Patrick O. Gribbin |
| 20 | February 2006 | November 2006 | Cody M. Ray |
| 19 | May 2005 | February 2006 | James B. Hartman II |
| 18 | January 2004 | May 2005 | Benjamin D. Agee |
| 17 | March 2003 | January 2004 | Jason G. Ross |
| 16 | April 2002 | March 2003 | Thomas C. Jones |
| 15 | September 2001 | April 2002 | Dr. Jerry C. Rice |
| 14 | February 2001 | September 2001 | Daniel M. Howard, Jr. |
| 13 | April 2000 | February 2001 | Mike B. Kane |
| 12 | March 1999 | April 2000 | Fredric W. Uhl II |
| 11 | February 1998 | March 1999 | Clinton R. Curl |
| 10 | April 1997 | February 1998 | Earl F. Roberts, Jr. |
| 9 | April 1992 | November 1993 | Brian C. Butler |
| 6 | January 1973 | December 1973 | Patrick L. Clark |
| 7 | January 1973 | December 1973 | Daryl C. Shipman |
| 8 | January 1973 | May 1973 | Patrick L. Clark |
| 5 | January 1969 | December 1970 | William T. Wilson, Jr. |
| 4 | January 1968 | December 1968 | Edward W. Clay Jr, M.S.W. |
| 1 | | | Timothy W. Hayes |
| 2 | | | David R. Schumacher |
| 3 | | | Edward W. Clay Jr, M.S.W. |