Like I edited into my earlier reply while you were replying, it appears as if the issue here is the logo itself and not the name.
Despite Activision's irrefutable knowledge of NovaLogic's superior trademark rights," reads the complain, "Activision created knockoff marks that are nearly identical [to] NovaLogic's design and word marks. Activision then shamelessly inserted these infringing marks throughout its competing first person military adventure video games." The complaint also makes reference to the various Modern Warfare 3-branded headsets, Xboxen and strategy guides in production that feature Activision's Delta Force logo.
And if I'm not mistaken, they don't even have a SSI patch in real life. The unit is so secretive that they eschew such things to help blend in. What I posted was the U.S. Army Special Operations Command airborne insignia, the command that "Delta Force" falls under direct control of.