saevikas says:
I noticed that in Ghost Ops, it mentions Rappelling as a skill you can get from career choices, but I don't see a skill description for it in that book or the core book.
It appears to be an oversight on their part. They have rappelling rules in their standalone version of the game but didn't include it in the SWADE print of the Ghost Ops book. Here's what the other book has to say about Rappelling, we'll just adapt these rules to SWADE.
Rappelling
Either down the side of a building or cliff or from
a chopper, the operator will use their Agility attrib-
ute with the Airborne Assault specialisation if avail-
able. Operators can be shot whilst rappelling as well
as have the line cut. If shot, the player must roll the
operators Reflexes attribute Vs a DN of 4 or let go of
the rappel line, they then must make an Agility test
against a DN of 6 to grab hold of the line and right
themselves. If the line is cut, the operator will fall,
taking falling damage.