Is there a secret pelican in halo reach?

well me and me mate did it. first u play new Alexander one of the buildings has legde sticking out under the ledge u fly under it and look up their is a button that looks like a calacorlator press it then get back in your falcon and drive throw that big circle and your falcon will turn into a pelican. note it will work im sorry i cant tell u witch building it is sorry.