buildspecial = Builds an inert Surface-to-Air Missile (SAM) Launcher.
An engineer must touch the launcher to activate it.
Once activated, it will target and attack enemy aircraft and weapons.

detspecial2 = Destroy SAM launcher

_special2 = Launch a remote. Your view will change to that of the remote.
You may NOT launch remotes in restricted areas.
Remotes will be either "old" (rocket) or "new" (aircraft) style.
See "ntf_help_remote" for details on remotes.

buildspecial2 or tripmine = Build a tripmine.

Touch an inert multigun to upgrade it to a Rocket Launcher.