I found a odd thing to me in the game yesterday. The NCR soldier at Primm that's at the bunker by the bridge to the town doesn't move or walk. I just started pushing him and was able to push him all the way to Nipton to the town hall. He will defend himself if attacked. I pushed him out of nipton a little ways in hopes he dies. It's weird he doesn't walk. I'm guessing he will reset eventually back to his location. I've just started the game so not far into it yet.