Select Distinct In A Query

I am working in Access 2003. I have a combo box based on the query below that works perfectly except that it shows duplicate Department Names in the combo box. I have not been able to find any way to show the Department Name only once. I have tried putting in SELECT DISTINCT in the string, but to no avail I recieve an error :
ORDER By clause(DepartmentMembers.[DepartmentMembers]) conflicts with DISTINCT.

Any light you can shed on this subject would be greatly appriciated. I have been researching forums for over two days and have not been able to generate a solution to this. Thank you in advance!

SELECT Departments.[Department Name], DATA.[BUILDING LOCATIONS], DATA.[REPORTS TO], DATA.[DIRECTOR NAME], DATA.[NUMBER OF PERSONNEL], DATA.[PC NAMING CONVENTION], DATA.[CISCO SWITCH(ES) ATTACHED], DATA.[SERVER-BASED APPLICATIONS USED], DATA.[DEPARTMENT SHARE (Z:DRIVE)], DATA.[EXTERNAL SERVERS], DATA.[Department ID]
FROM (DATA INNER JOIN DepartmentMembers ON DATA.[Department ID]=DepartmentMembers.[Department ID]) INNER JOIN Departments ON (Departments.[Department ID]=DepartmentMembers.[Department ID]) AND (DATA.[Department ID]=Departments.[Department ID])
ORDER BY Departments.[Department Name], DepartmentMembers.[Department Members];