1988 & 2007 ~ Thomas E. Hipple
1990 & 2006 ~ G. Theodore Cowin
1991 & 2005 ~ Charles R. Huskey
1998 ~ James G. Cox
1999 ~ Daniel J. O'Leary
2001 ~ Larry W. Sutton
2003 ~ Richard R. Crossler
2004 ~ Rex R. Benson
2008 ~ Anthony G. Such
2009 - Jack O. Sage