The Iranian Government claims that they have reversed engineered the old U.S. area surface-to-air missile system the HAWK. This is a Army and Marine Corps weapon that was rapidly replaced by the PATRIOT in the Eighties. Not that it wasn't an effective or state-of-the-art system in the day but it has been many decades since it was something the U.S. wanted to use.
Probably this is based on old equipment the Shah had bought many a year ago. As to whether it will provide an effective defense against modern U.S. attack aircraft remains to be seen. I would presume not.