Hunter Base

The Hunter Base (ハンターベース) is the headquarters of the Maverick Hunters organization, founded by Dr. Cain to counter the rising Maverick revolts.

History
In The Day of Sigma, the Hunter Base is located in Abel City. In Mega Man X2 it appears briefly during X's conversations with Dr. Cain. In Mega Man X3 it is located in Dopple Town and is attacked by Dr. Doppler's forces in the beginning of the game, being the Opening Stage. It is later revisited for cutscenes.

From Mega Man X4 to X6 the base appears as the stage select screen. In Mega Man X5 Dynamo attacks the base, and the battles against him also take place inside it. Mega Man X7 features the base during most of its cutscenes, and Mega Man X8 has it as the stage select screen just like its PlayStation predecessors. In that game, it also appears at the R&D Lab option menu, as well as during Sigma's reveal cutscene.

In Mega Man Xtreme, the Hunter Base's Mother Computer is hacked and all of its data is overwritten, and the resulting fake data has sent the whole world spiraling into chaos.

In Mega Man X: Command Mission, Giga City's Central Tower is used as a Hunter Base in the battle against the Rebellion Army.

Mega Man (Archie Comics)
The Hunter Base has brief appearances in the comic series, being first seen in one panel from Mega Man #35. It also has an appearance in the special story "The Choice" in Mega Man Issue #50.

Rockman X manga series
The Maverick Hunter Base was heavily damaged when Sigma became a Maverick. A Neo Maverick Hunter Base is built in Doppel Town in the Rockman X3 manga.

Irregular Hunter Rockman X
The 17th unit headquarters is commanded by Sigma.

Trivia

 * Mega Man X is the only numbered game not to show any glimpse of the Hunter Base, which was compensated on its remake.