Killzone: Mercenary - Mission 9 (Exit Wounds): Covert Contracts (walkthrough)

Contract loadout requirements: M2, M98 Flash

The mission requirements:

• Interrogate Benoit  
• Finish the mission in 25 minutes
• Tranquilize and kill 15 enemies
• Destroy all 7 propaganda speakers

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Interrogate Benoit  

• Regular Way: Shoot the "fuel rods" which Justus (the kid) rise up for you when Benoit get close to them. You than uses the opportunity when Benoit is in diz to go around and punch (melee) him in the back. Repeat this until he fall than you can finally Interrogate him like any enemy officer.
• Alternative Way: (Not Guarantee, Might kill him), Uses the VAN-Guards: Arc Missile and shock him from a distance. Any VAN-Guards will not work if Benoit get too closes to you.       

  

Finish the mission in 25 minutes

Time is not an issues if you finish the tranquilize kill and flash grenade kill early.
   

Tranquilize and kill 15 enemies

I would recommend you to do this objective after or in between the "Flash kills objective" using the same setup/load-out which are wear the Supply Armor with the same reason as to have more ammo. It is best to finish this objective before you face and fight the two "Heavy". Now the quick way I found to do this is to shoot the tranquilizer (M2) at an enemy, don't reload, and rush and melee them. It is after you melee kill than you reload your M2.  

Flash and kill 5 enemies

I recommend you do this at the start of the mission, it best to uses "Down: Quick throw grenade" button to do this. I also high recommend you wear the Armor: Supply for extra grenade. If you did follow my recommendation, then it best to remember to not be too close when you throw the Flash grenade.