Palestinian and Iranian officials are denying that there are any military relations between the Palestinian Authority and Iran. But Iran has denied military involvement in Lebanon, where it has been an open secret for decades that religious conservatives from Iran supply weapons and money to support Hizbollah's attacks on Israel. Hizbollah and Palestinian terrorist organizations have long worked together. A recent example of this was the revelation that Iran obtained 1980s era US Stinger anti-aircraft missiles and provided them to Hizbollah in Lebanon (for use against Israeli aircraft.) But the missiles proved defective (the special batteries give out after a few years and the propellant becomes useless after about 15 years.)