AX-235

AX-235 was a Rebel outpost hidden in the asteroids of Cron Drift. It was the very outpost that intercepted the Imperial transmission with the schematics of the Death Star.

Behind the scenes
The scenario of the X-Wing is somehow inconsistent to the A New Hope opening crawl, according to which the plans were taken during a battle which was also 'the first victory' against the Empire. According to the game, the Rebels had many victories before that event, whereas the opening crawl stated that they only had one major victory.

This can be explained by retconning that the outpost did not actually get the final plans, but only learnt about their existence. The plans carried to Tantive IV in a later mission of the game, although implied to be the same ones taken from the outpost, are retconned now to be those taken by Kyle Katarn during the Battle of Danuta (elements that in fact did not 'exist' when the game was made).