The Driver moves silently in Cerberus Mk 2

Gibbs settled in on one side of her, Hector on the other. She didn’t hear the exoskeleton, but sometimes Cesar managed to move damned quiet in it. Better than she ever could. She hoped he was right behind them.

Excerpt From Ex-Isle, pg 511
Peter Clines
https://books.apple.com/us/book/ex-isle/id989619017