First, ranks.
[hider=US NATO ranks]
http://en.wikipedia.org/wiki/Ranks_and_insignia_of_NATO_armies_enlisted
http://en.wikipedia.org/wiki/Ranks_and_insignia_of_NATO_armies_officers

NATO RANKS, from 
lowest
to
highest:
ENLISTED

Private
Private First Class
Specialist
Corporal
Sergeant
Sergeant First Class
First Sergeant
Master Sergeant
Sergeant Major
Command Sergeant Major
Sergeant Major of the Army

OFFICERS

Officer Cadet
Officer Candidate
Second Lieutenant 
First Lieutenant
Captain
Major
Lieutenant Colonel
Colonel
Brigadier General
Major General
Lieutenant General
General
General of the Army
[/hider]

Second, now that I've read the Patton, I have one impression:

OP.

A big-ass mech doing 80? Hell no. Mechs will require hydraulics; they're the best modern technology to hold up heavy things that's most similar to an arm. And hydraulics are NOT fast. Going 80 mph? Never. 20? Maybe, if you're lucky and it's small and light.

This isn't a game; hydraulics extend and then come back in again, and it isn't instant. Four legs moving fast enough to go 80 mph is just flat-out impossible for this. I've been in scifi roleplays, and even then we've never had mechs moving 80 mph!

Tracks are faster than hydraulics, and it took over an hour to go three miles. I know, I've worked with excavators. My dad owns two of them. I've run on both of them. They're powerful, yes, but slow. And moving fast with hydraulics and the like will mean you'll end up screwing everything up. Fully extended legs will screw up hydraulics to the pint where you'd be lucky if they ran correctly for an hour much less if during combat.