Enemy Territory's True Combat mod doesn't put any items in the menu, although it includes a .ico file. I'm attaching a .desktop file and the xpm file from the ico file.
Created attachment 99364 [details] enemy-territory-truecombat.xpm
Created attachment 99365 [details] tcetest-et-tcetest.desktop
None of the ET mods install a desktop icon of any kind. However, I have a new eclass in the works that will replace the current one and resolve this, but it will be a while. Also, you can't just go and take someone else's property (the icon) and change it (convert to xpm) and distribute it unless the license permits it.
Well, this is fixed in ~arch and will be hitting stable after the requisite 30 days.