Honestly, I believe Bungie got a lot of insipiration from alot of the ideas in ST. For Example...
Main weapon in ST [url=http://www.bugsinmyhead.com/img/fro_morita.jpg]looks similar to a B.R slash Assualt rifle.[/url]
Bug Bombs [url=http://moviesmedia.ign.com/movies/image/article/102/1028155/top-10-movie-space-battles-20090925082938274.jpg]remember the opening scene in Halo C.E.?[/url]
Marines
[url=http://www.renegadeeffects.com/Reel_web_Images/SST_Armor_3.jpg]look quite similar[/url]
spaceship [url=http://www.starshipmodeler.com/other/jb_tac_hero.JPG]looks earily like a pelican, except for the color[/url]
There are also multiple references in starship troopers to "glassing a planet."
Starship Troopers came out in 1997, Right about the time Halo C.E. was being developed. I'm almost positive they took some inspiration from this film.
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Bungie also got the Halo ring planet thing from a book called Ring World. Let me look it up. EDIT: [url=http://en.wikipedia.org/wiki/Ringworld]Here ya go.[/url] [Edited on 07.07.2011 8:26 PM PDT]