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Check this video out: [ame=
https://www.youtube.com/watch?v=PdNkgQ6JcAk]YouTube - Halo Reach easy credits[/ame]
Just follow the video.
Go to Campaign.
Select third Mission: Oni: Sword Base
Doesn't matter what difficulty you choose, just pick Normal.
No skulls required.
Begin at the Mission Start.
Run up the ramp on the right during the start of the mission. IGNORE ALL ENEMIES!
RUN Right and enter the underpass pick up the AIRSTRIKE GUN THINGAMAJIG.
Shoot a couple of times so you get more enemies into one big spot.
Now the key is to use the laser airstrike and get the checkpoint right before it hits the enemies. If you do it correctly you can get 10+ kills / 2 seconds. For the guy in the video its like 10 enemies/ 10 seconds. Plus he has to set the airstrike and etc...
After you keep reverting to checkpoint. This counts towards Splash Damage and Walking Tank. All the other medals such as Spec Ops and Cannon Fodder depend on what enemies are killed in the airstrike.