I can definitly see the comparison between the bug plasma and the Wraith's plasma. As for the human weaponry, the UNSC Marine weapons and gear is mostly influenced by the weapons and such of the Colonial Marines from "Aliens", as previously mentioned. Matter of fact, if you zoom in on the bulletin board outside of the bridge aboard the Pillar of Autumn after Captain Keyes gives you the M6B Pistol, you'll see a "Missing" poster for Ripley's cat, Jonsie.
And just for the record, the guys from "Starship Troopers" like being called Mobile Infantry, not Marines. ;)
http://uscmcrpg.net/missions-=Making the galaxy safer, one bebop at a time...=-