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From my understanding, there are three SDFs:

  * The SDF-1 which was the major focus of the first season.
  * The SDF-3 which is the flagship of the Robotech Expeditionary Force (REF), where Rick Hunter is.
  * The SDF-2 I wasn't too sure about, as at first I thought it was a separate ship built, but it was apparently destroyed with the SDF-1 in the final episode of the first season. (Not entirely sure if it's a separate ship or the repaired SDF-1.)

However, in Episode 78 ("Ghost Town"), the communications from the REF were
coming from the SDF-4, so I'm wondering: How many SDF-#'s are there, and are
they all the same as the SDF-1 (minus the aircraft carriers which were just a
patch job)?


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robotech
How many SDF-#'s are there?


The [Robotech Wikia](http://robotech.wikia.com/wiki/SDF) has a list for SDF-1,
SDF-2, SDF-3, SDF-4 and SDF-7. It includes a listing for SDF-M, but I don't
think that was in the TV series (it's mentioned in the Robotech comics).
Wikipedia also has a list of [Robotech
vehicles](http://en.wikipedia.org/wiki/List_of_Robotech_vehicles) that has a
lot of detailed information of 1-4.

  * **SDF-1** : Robotech TV series
  * **SDF-2 Megalord** : Robotech TV series (starting from episode 26)
  * **SDF-3 Pioneer** : First appeared in ["Crystal Dreams" promo](http://images1.wikia.nocookie.net/__cb20120820223908/robotech/images/f/f6/Incomplete_SDF3.jpg) and in the Robotech II: The Sentinels series
  * **SDF-4 Izumo/Liberator** : Last episode of the original series
  * **SDF-7** : Robotech II: The Sentinels novels 
  * **SDF-M** : Invid War: Aftermath comics

The SDF-7 was a Horizon Class T ship, so it's not like SDF-1.


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What is canon and what is non canon in Robotech is a mess, but basically the
Robotech series, and the Robotech Shadow Chronicles and Robotech Love Live
Alive movies are canon and the rest of movies (Robotech The Sentinels and
Robotech the Untold Story) and novels and most comics are not

**There are 4 canon SDF that you could count as "real". There are more in
novels and such but they are non canon versions.**

The canon SDFs are SDF-1 and SDF2 which appears in the canon Robotech series
(well sort of, the SDF-2 is mentioned but never seen in the series) . The
SDF-3 appears in the non canon Robotech The Sentinels movie so because of this
it shouldnt count, but it also appears in the canon SDF-3 Shadow Chronicles
movie, so you could count it as "real" because of this. The SDF-4 appears in
the canon Robotech series and in the canon Robotech Shadow Chronicles movie.

Also what is canon might change over the years, the first 2 Robotech movies
when they were made were meant to be canon (and they had its creator involved)
but they were de-canonized later.


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