Storm spots a small gap that he waves Wes through, and the Marine gets the group to what looks like the entrance to some sort of underground facility.
(9 Successes; 1 failure; skill challenge navigated successfully)
The Imperials didn't seem to have left a guard on the door, or any kind of lock, so the four Republic officers moved on in, following a tunnel that lead to what looked like an elevator. Except that it didn't seem to be working.
* * * * *
"We'll take an assault shuttle down, land just out of sight of where the XO's team first spotted the Imperials, and proceed from there. We won't be trying to be too sneaky, but the captain doesn't think an air strike is in order here." The Marine Lt. said.
And indeed, the Navy pilot that was staying on board the shuttle (she mentioned something about air conditioning) set the assault shuttle down pretty nearly right next to Zennith's fighter.
The two fire teams of Marines were not trying to hide their presence from the Stormtroopers. They were packing enough firepower to make sure any Imperial that didn't surrender immediately would have no time to call for help. At least, not unless there were far more sentries than Rosa's team had reported.
* * * * * *
Zennith received a flash with Istara's new orders -- and an update on what else the captain was sending planet-side -- while she was still descending. Although she was fairly confident a Jedi could make it past a few Imperial sentries on her own, letting the Marines do their job was perfectly reasonable, and that current in the Force that had pulled her down to the planet seemed persistent, but not desperately urgent.
So not too long later, the Marine Lt (OOC: I need to give a name -- and a species and gender -- to this person

) was setting up his team to cover the exit, and Zennith and the pair of ensigns followed the first group inside... and caught up with them before they had made any progress on the elevator.
Istara took her new orders from Zenith.
"Sounds like you guys get to have all the fun." She said before leaving.