VATS
Vault 101
How to Detonate C4 While Using a Chopper Gunner
(This is a video tutorial. Instructions will scroll across the bottom of your screen.)
Step-by-Step Tutorial:
1.) Plant your C4. (You can do this anywhere, and on any map.)
2.) Call in your Chopper Gunner, or Gunship.
3.) When you see an enemy come close to where you planted the C4, double tap the " X " button. (<--- Xbox 360 Controls.)
4.) Your C4 will detonate, and kill any enemy within it's range.
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Have Fun Blowing Up Your Enemies, While You're Raining "Death" From Above.