In that one Quarry junction place that was infested with Deathclaws, I snuck up on top of the rockwalls and sniped them all out. Although my companions bought it a couple times because they don't know how to climb on top of things... (No NPC's do. That's why I could kill the Deathclaws.)

Btw: does this bother anyone else?
SPOILER!!:
That you have to destroy the Brotherhood of Steel in order to go forward with the main story line, apparently? Or if you choose to align with any other faction, you have to kill Mr. House? There was a peaceful way to deal with the Great Khans and the Kings... The Brotherhood of Steel particularly bothers me, because Veronica is my companion. And she doesn't even have a dialogue for the situation! It's particularly stupid with the NCR, as per she's standing right there when you get the orders.)
Anyhoo...

Wuv, Yer Mom