The official justification for the arms shipments was that they were part of an operation to free seven American hostages being held in Lebanon by Hezbollah, a paramilitary group with Iranian ties connected to the Islamic Revolutionary Guard Corps. The plan was for Israel to ship weapons to Iran, for the United States to resupply Israel, and for Israel to pay the United States. The Iranian recipients promised to do everything in their power to achieve the release of the hostages. The first arms sales authorized to Iran were in 1981, prior to the American hostages having been taken in Lebanon.