Fallout: New Vegas

[Guitar Woman]

Where do Rex and ED-E go when you dismiss them from your party? They don't seem to be at the Lucky 38 with my other companions, and otherwise I've got no idea where to start looking.

I wouldn't mind without them so much except that even with the Riot Shotgun and Reinforced MKII Combat Armor, Cass gets killed really really easily in high-risk fights, like the Legate clusterfuck at Hoover Dam. I don't want to use another companion because she's my favorite character in the game.