Fluel Rod Gun/Flamethower achievement?

Thats right! An achievement for finding the original Halo fluel rod gun and flamethower somewere in the camaign. In halo 2, they had you find the scarab gun on top of New Mombasa. The same principle would apply here, if you can find it, you can use it! I would love this achievement since you never got to use these weapons in Halo 1. I hope this is included!