How would you stat the Master Chief, or any Spartan, for that matter? Maybe the Covanent can be stated as well.
Spartan II
-2 Inhuman Strength
-2 Inhuman Speed
-2 Inhuman Toughness
-2 Inhuman Recovery
+2 Catch (Severe Trauma)
-_ Stunts
+2 IoP (Mjolnir Armor) (Pick and choose to fit Refresh, different models had different abilities)
-2 Supernatural Strength
-2 Supernatural Speed
-2 Supernatural Sense Mod (Radar)
It Is What It Is, Armor:3 vs. All
-4 Modified Enchanted Item for Shields, +7 Block, 3 Uses Per Scene (Approximately 3 Refinement could afford this, plus another for not having Ritual or Thaumaturgy)
Skills*: (Sumberged [35], 12 [40], 14 [45], 18 [60, at +6])
+5 Guns, Athletics
+4 Fists, Alertness
+3 Endurance, Intimidation
+2 Presence, Conviction, Discipline
+1 Stealth, Rapport, Survival, Scholarship, Driving
+5 Guns, Athletics
+4 Fists, Alertness, Endurance
+3 Stealth, Discipline, Intimidation
+2 Presence, Conviction, Driving
+1 Survival, Scholarship, Rapport
+5 Guns, Athletics, Endurance
+4 Alertness, Discipline, Fists
+3 Conviction, Survival, Intimidation
+2 Driving, Presence, Craftsmanship
+1 Might, Scholarship, Survival
+6 Guns, Athletics
+5 Alertness, Fists, Endurance
+4 Discipline, Intimidation, Weapons
+3 Conviction, Presence, Intimidation
+2 Driving, Scholarship, Might
+1 Rapport, Contacts, Craftsmanship, Investigation, Empathy
*Besides Guns, Athletics, Fists, and Alertness, feel free to swap around a bit. Every Spartan was different. These examples vary a bit. Some drive, some will use Energy Swords, etc.
You could play as an unarmored Spartan for -6, although they would have a number of Stunts, so I'd say a Submerged could cover one with old armor and some Stunts.
Grunt
Refresh:
I Dunno, not much. Maybe a Suicide Stunt
Maybe -2 Inhuman Toughness, with a Catch of Headshots. The confetti popping out is a sign.
Skills:
Guns +3
Athletics +2
Alertness -1 (They suck, you catch them asleep in a warzone)
Discipline +1 (gotta give them some, a hundred of their buddies are killed in front of them, and they will still charge in some cases)