Spartan Frank Kodiak increased his foot speed ever so slightly and drew up next to the captain, matching her pace. He could easily have exceeded it.
	...
	Her gaze flitted for just a moment to his right arm. He was wearing his long-sleeved undersuit over it and so it seemed exactly the same as his left arm. Quickly she looked away. It wouldn’t be good form for her to be caught staring at it. 
	“You can’t tell, can you, Captain.” It wasn’t a question, and he wasn’t looking at her. Damn. His peripheral vision is amazing.
	...
	“You’re aware that Spartan Kodiak has an artificial right arm, yes?” 
	Of course. She’d been staring at it earlier.

Halo: Hunters in the Dark Ch 4