Elite soldiers within the Rebel Alliance, known as Rebel Vanguards, were equipped with PLX-1 missile launchers and donned uniforms that were based on the attire of Alderaanian consular security forces.
These Rebel Vanguards are featured in Star Wars: Commander, the mobile app from 2014, accessible after unlocking them via campaign progression. Furthermore, they can be found in the Rise of the Empire expansion for the Star Wars: Rebellion board game.
Within the Legends continuity, the designation of Alliance heavy troopers as vanguards initially occurred in the 2004 video game Star Wars: Battlefront.