M,
Make two queries.
qryMaxes:
Select BarcodeID, Max(AssignedDate)
From tblEquipment
Group By BarcodeID
Then use that query to get the specifics for that date:
Select A.BarcodeID, A.AssignedDate,
B.Employee, b.WorkSite, b.EquipmentDesc
From qryMaxes As A Inner Join...