They are basically a stronger version of Trooper Veteran.
Gallian Trooper ElitesEdit
Trooper elites did not appear in Valkyria Chronicles.
Valkyria Chronicles 2Edit
Valkyria Chronicles 3Edit
When a shocktrooper classes up to a trooper elite, they are able to equip flamethrowers, replacing the role of commando from Valkyria Chronicles 2.
GRA Trooper ElitesEdit
The GRA have no known Trooper Elites.