How do can I concatenate the first and last name in this union query in Access 2007

How could I concatenate the output of the first and last name in this query? This is used in a data connection for an excel spreadsheet. Right now, the output is first and last names in separate columns. I want them in one column, last name first.

SELECT tbl_Classes.Class_ID_pk, tbl_AM_Operators.User_ID, tbl_AM_Operators.Last_Name, tbl_AM_Operators.First_Name, tbl_Skills.Flow_fk, tbl_Skills.Queue_fk, tbl_Class_Skills.Skill_ID_fk, tbl_Classes.Training_Date, tbl_AM_Operators.Supervisor_ID, tbl_AM_Operators.Bank, tbl_AM_Operators.Status, tbl_AM_Operators.Status_Date, tbl_AM_Operators.Return_Date, tbl_Classes.Shift, tbl_Classes.Class_Name, tbl_Class_Rosters.User_ID_fk
FROM (tbl_AM_Operators INNER JOIN ((tbl_Classes INNER JOIN tbl_Class_Rosters ON tbl_Classes.Class_ID_pk = tbl_Class_Rosters.Class_ID_fk) INNER JOIN (tbl_Skills INNER JOIN tbl_Class_Skills ON tbl_Skills.Skill_ID_pk = tbl_Class_Skills.Skill_ID_fk) ON tbl_Classes.Class_ID_pk = tbl_Class_Skills.Class_ID_fk) ON tbl_AM_Operators.User_ID = tbl_Class_Rosters.User_ID_fk) INNER JOIN (SELECT
        tbl_Skills.Skill_ID_pk
      , tbl_Class_Rosters.User_ID_fk
      , MIN(tbl_Classes.Training_Date) AS MinTrngDate
FROM (tbl_Classes
INNER JOIN (tbl_Skills
INNER JOIN tbl_Class_Skills
        ON tbl_Skills.Skill_ID_pk = tbl_Class_Skills.Skill_ID_fk)
        ON tbl_Classes.Class_ID_pk = tbl_Class_Skills.Class_ID_fk)
INNER JOIN tbl_Class_Rosters
        ON tbl_Classes.Class_ID_pk = tbl_Class_Rosters.Class_ID_fk
GROUP BY tbl_Skills.Skill_ID_pk
       , tbl_Class_Rosters.User_ID_fk)  AS qryUserSkill_MinDate ON (tbl_Skills.Skill_ID_pk = qryUserSkill_MinDate.Skill_ID_pk) AND (tbl_AM_Operators.User_ID = qryUserSkill_MinDate.User_ID_fk) AND (tbl_Classes.Training_Date = qryUserSkill_MinDate.MinTrngDate)
ORDER BY tbl_AM_Operators.Last_Name, tbl_Classes.Shift, tbl_Classes.Class_Name

UNION SELECT

tbl_Training.Training_ID_pk AS Class_ID_pk,

 tbl_AM_Operators.User_ID, tbl_AM_Operators.Last_Name, tbl_AM_Operators.First_Name, tbl_Skills.Flow_fk, tbl_Skills.Queue_fk, tbl_Training.Skill_ID_fk, tbl_Training.Training_Date, tbl_AM_Operators.Supervisor_ID, tbl_AM_Operators.Bank, tbl_AM_Operators.Status, tbl_AM_Operators.Status_Date, tbl_AM_Operators.Return_Date, tbl_AM_Operators.Shift, "Individual Training" AS Class_Name, tbl_Training.User_ID_fk
FROM (tbl_Skills INNER JOIN tbl_Training ON tbl_Skills.Skill_ID_pk=tbl_Training.Skill_ID_fk) INNER JOIN tbl_AM_Operators ON tbl_Training.User_ID_fk=tbl_AM_Operators.User_ID;