[quote=@chayden13]
[@Sep]
[@HeySeuss]

As a special forces unit, I'd imagine that they were either the first wave of the assault or acted as a diversionary attack, in order too draw the main force of Imperials away from the true objective.
[/quote]

They probably performed site reconnaissance, identified landing zones and got a layout of the place prior to assault. 

[quote=@Sep]
[@chayden13] that's what was what I had in mind, but I believe Seuss was wondering more in terms of what Besk was doing on the last mission.
[/quote]

The way I see it, when the Anaxes op started to go south, they provided some sort of fire support to disrupt the Imperial reinforcements and buy time for the main force to extract. That would depend on the SpecForces guys being in U wings which have hyperdrive capability. I'm going with the idea that they were mostly calling in starfighter support and designating targets, since engaging with their own weapons would be insufficient and reveal their position. That makes a lot of sense since Besk did the recon, his team knew the terrain the best. Once the rest of Rancor was in the clear, they probably got on the U-wings and got the hell out.