Halo 3 Vehicle Question?

[Nakz]

Ok look i want to know where two vehicles are for my example i know that the elephant is on the map sandtrap and on forge you can not create it or find it on other maps(most prob cus it too big) now i cant make the Pelican or the Phantom etheir but i don't know which map they are on can someone tell me which map they are on or if i you can even drive them and please someone answer soon because i'm having friends come by to play, thanks for your help oh and one more thing how do i set slayer on custom games to use just swords because i know they have the varient already made with rockets and infinite ammo so if anyone knows that also please tell ty