<br/>Riska's listed as an E7 - Gunnery Sergeant, which is the third sergeant rank in the USMC according to my hub's best friend, who was a career marine and a Mastery Gunnery Sergeant at retirement.  He made E7 in 7 years, after enlisting at 17.  Riska's 28, and a smart gunner, so I think it makes sense for her to be a gunny.  I assume that Amrillo is above her rank , so he should be at least a Master Sergeant to outrank her ;)