This doesn't need to be on Heroic. I've done it plenty of times on normal and easy, dunno about legendary though. Also, you can get this on Metropolis too. Do any difficulty, play thruogh till you get to the part with the 2 Marines in the Warthog at the tunnel. Destroy the Warthog BEFORE you get to the wall area with Jackals. The Marines will be alive, the Warthog done for, and your 2 Invincible Marines!
- I'll add that on, as I am about to start an article cleanup. Oh, and please remember to sign your posts with four tildes (~~~~). Emosworld 07:03, 10 September 2007 (UTC)
I'm pretty sure that the marines in halo 1 are invincible. No amount of frag grenades will kill them. Matortheeternal 23:24, 31 May 2009 (UTC)