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Add-on
From The StarCraft 2 Wiki
An Add-on is a minor Terran building added to enhance the capabilities of one other major Terran building.
Background
These add-on buildings help provide additional power, surveillance, data storing capabilities, further spare parts or just more room. A building erected for this reason is not capable of liftoff, like the major building. The smaller building can be taken over by other Terran factions for their own use, by attaching a major building next to it.
In the beginning of the Protoss/Zerg invasion of Terran worlds, these add-ons were slightly less sophisticated, and more cumbersome. One specific add-on could only service one major building, like a Factory could only attach a Machine Shop, no other designs of add-ons.
In the old system, this is how major production facilities used add-ons:
However cumbersome, the use of these add-ons were still highly successful in the combat zone, and the technique has been greatly improved since then. The actual major production structures have been slightly remade to allow for a more flexible add-on system, where things like the tech equipment and high-powered reactors have been moved out of the structure design, allowing space for more production space, or tools like the Factory machine shop inside the building. Even the Barracks have been remodelled internally, allowing the use of space to be used for either high tech units, or mass production.
The Sience Facility has mainly been converted into an add-on called the Tech Lab, and the Covert Ops station has been moved and improved for field duty into the old Academy, rebuilding it completely into a Academy for Ghosts only.
The newer system uses a layout where any production structure can use any add-on:
 | This article is a stub because it can be filled out more and needs pictures. Help by expanding it. |
| Navigation - Protoss - Terran - Zerg [e] |
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| Terran Units (StarCraft II) [e] | |
|---|---|
| Ground Units: | SCV | Marine | Marauder | Ghost | Reaper | Hellion | Siege Tank | Thor |
| Air Units: | Viking | Medivac Dropship | Raven | Banshee | Battlecruiser |
| Basic Buildings: | Command Center | Supply Depot | Refinery | Barracks | Bunker | Engineering Bay | Missile Turret | Planetary Fortress | Sensor Tower |
| Advanced Buildings: | Ghost Academy | Factory | Merc Haven | Orbital Command | Armory | Starport | Fusion Core |
| Support Buildings: | Tech Lab | Reactor |
| Hero ground units: | Jim Raynor | Tychus Findlay |
| Cancelled Units: | Cobra | Firebat | Predator | Medic | Dropship |
| Cancelled Buildings: | Sensor Tower | Munitions Depot | Starbase | Shadow Ops |
| Terran Units (StarCraft I & Brood War) [e] | |
|---|---|
| Ground Units: | SCV | Marine | Firebat | Medic | Vulture | Goliath | Siege Tank | Ghost |
| Air Units: | Dropship | Wraith | Valkyrie | Battlecruiser | Science Vessel | |
| Basic Buildings: | Command Center (ComSat Station & Nuclear Silo) | Supply Depot | Engineering Bay | Barracks | Refinery | Missile Turret | Academy | Bunker |
| Advanced Buildings: | Factory | Machine Shop | Armory | Starport (Control Tower) | Science Facility (Physics Lab & Covert Ops) |
| Hero ground units: | Gui Montag (fb) | Terran Civilian | Sarah Kerrigan (g) | Samir Duran (g) | Alexei Stukov (g) | Alan Schezar (gol) | Jim Raynor (vul, mrn) | Edmund Duke (st) |
| Hero air units: | Tom Kazansky (wrt) | Magallan (sv) | Hyperion (bc) | Norad II (bc) |
| (fb) = Firebat -- (g) = Ghost -- (gol) = Goliath -- (v) = Vulture -- (m) = Marine -- (st) = Siege Tank -- (wrt) = Wraith -- (sv) = Science Vessel -- (bc) = Battlecruiser | |
