Steel and Thunder: Unique Units adds one additional Unique Unit to every Civilization including all DLC and Rise & Fall Civilizations.
The additional Unique Units are as follows:
AH-64 Apache (America)
Camel Archer (Arabia)
Khopesh Warrior (Egypt)
Medicine Man (Kongo)
Jaguar Warrior (Aztec)
African Forest Elephant (Nubia)
Isijula Warrior (Zulu)
Hui Hui Pao (Mongolia)
Turtle Ship (Korea)
War Canoe (Khmer)
Kris Warrior (Indonesia)
HMCS Haida (Canada)
Numidian Cavalry (Phoenicia)
Templar (Eleanor of Aquitaine, England/France)
Steel & Thunder: Unit Expansion is not required to run Steel and Thunder: Unique Units but it is recommended.
Steel and Thunder: Unique Units together with Steel & Thunder: Unit Expansion are the sequel to Moar Units which is no longer maintained. Neither of the Steel & Thunder mods is compatible with Moar Units.
Enabling units from Moar Units that are disabled by default
Moar Units added two addtional Unique Units per Civilization - these units are included with Steel & Thunder: Unique Units but are disabled by default. To enable them you can alter the Enabled flags in MOARUniqueUnitsUserSettings.sql and MOARUniqueUnitsConfigUserSettings.sql. These files can be found at ....\steamapps\workshop\content\289070\1362931045\Data.
In the above SQL files you'll see a bunch of lines like this top: INSERT INTO EnabledUniqueUnits (CivilizationType, Type, Enabled, DefaultReplaces, DefaultUpgrade, UnitAiBaseUnit) VALUES ('CIVILIZATION_AMERICA','UNIT_AMERICAN_AH64_APACHE', 1, 'UNIT_HELICOPTER', NULL, 'UNIT_HELICOPTER');
The number 1 after the unit name means that this unit is enabled. If it is 0 (zero) then the unit is disabled. If you want the Civ selection screen to be updated too then you need to alter the file MOARUniqueUnitsConfigUserSettings.sql to reflect which units you have enabled/disabled in MOARUniqueUnitsUserSettings.sql.
Steel and Thunder: Unique Units 1.43
Adds a second Unique Unit to every civilization