Killzone: Mercenary - Mission 4 (Diplomatic Incident): Demolition Contracts (walkthrough)

Contract loadout requirements: VC-G11 Gas, VC39

The mission requirements:

• Kill 10 enemies with gas grenades 
• Kill 30 enemies with VC39 Accelerator Rifle
• Achieve 5 Mercy kills
• Injure 10 enemies

My recommendation to bring along on this contract loadout:

• Van-Guard Systems: Arc Missile

Please note that a Helghast flamethrower trooper cannot be injured in any way beside killing them normally while an officer cannot be "Mercy killed".   
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Kill 10 enemies with gas grenades  

There are plenty of enemies on this mission to do this objective; please note that VC-G11 Gas has zero to no affect on helghast flamethrower troops so don't bother try to gas them.     

  

Kill 30 enemies with VC39 Accelerator Rifle

There are plenty enemies on this mission to do this objective.
   

Achieve 5 Mercy kills

Methods and their chances of success (only will happen if the enemy are injured):

• VC-G11: Low Chance even if the enemies is on the outer edge of the gas
  
• Arc Missile: High Chance if it one vs one situation.
• Melee: High Chance (100%), will not get mercy kill from enemy's officer    

      

Injure 10 enemies

 

Methods and their chances of success:

• VC-G11: Average Chance if the enemies is on the outer edge of the gas
  
• Arc Missile: High Chance if it one vs one situation.
• M2 Tranquilizer Pistol: High Chance (100%) if you hit the enemy (will not work on Helghast flamethrower) 
• Average or Low Damaging Gun: A chance if you attack their leg in one vs one situation where you might have more control of how many shot is taken.