"...during the Strategy Phase ... you might ... launch a "Special Assault." Once per campaign turn, your team may declare that one of your assaults is a Special Assault, and it's then fought according to one of the campaign's two faction-specific objectives:
- The Rebel Alliance may launch a Hyperlane Raid.
- The Imperial Navy may proceed with a Show of Force".
From "Playing the Long Game"
Special Assault Objective Cards are part of "The Corellian Conflict" Campaign. In each Campaign Turn a team can declare 1 attack as a "Special Assault". The following battle will focus on accruing Ressource Points, which are needed for securing locations for the team or refitting the team's fleets.
Each team is limited to 1 "Special Assault Objective Card" only!