I am looking for a pelican that does not have rocket launchers. I would like to have one of those pelicans with a turret in the back, but if not, a pelican with just a gun in front would be fine. I know there are maps that have such pelicans, but I can't think of which maps I've seen them on.

I thought of that, but then you still have the rocket launcher boxes hanging under the wing, and I would really like to have the version with the turret in the back. I know I have seen it some map before, but I can't think which map.
Thanks though.

Rip it from campaign, or you could change the shader the model uses for the rocket launcher to a shader with an invisible bitmap

That would be a waste of memory.

Better to just delete the launchers and the associated nodes in max/blender and recompile the model.

Additionally another issue you may face with invisible shaders would be weird collision.

By which I mean material responses triggering on an area which looks to have no form or structure to react with.

Yeah it would, I'm assuming he doesn't have knowledge of that, and halo doesn't take up much anyways.
Forgot to mention you'd have to change the seat for the peli.