You are right Craig, but I'm still having fun...
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Conrad S. Hauser, code-name: Dook (DooQ)? (Don't step in it!!)

Firefighter: BarBeeQ

Green Beret: Phal-khan (maybe that would be his middle east cover name...)

Jungle Expert: Recon-Doh! (that might infringe Homer Simpson)

Warrant Officer: Flynt or Phlint or Phlynt

VAMP Driver: Klutch

Heavy Machine Gunner: Road-blawk or Road-bloc

Bio HazMat Containment: Heir-tite (okay, that was bad...)

L.R.R.P: Rekoil

There really are more creative ways of getting around trademark and copyright issues without retaining a character and giving them a completely new code name.