The Iranians have equipped and paid for, and trained, a massive unguided rocket and guided missile force in Lebanon. These missiles are in-place as a MAD force. The total number of missiles and rockets in Lebanon are variously estimated at between 40,000 and 110,000. While many are unguided Katyusha rockets, many are longer ranged guided missiles. All are operated by Hezbollah Special Forces launch teams.
The Hezbollah Special Forces are in-effect a highly trained and well-equipped Iranian commando force of at least a Brigade in size. They man and protect a large number of mostly unguided and rather crude rockets, generally Katyusha 122mm artillery rockets with a 19 mile/30km range and capable of delivering approximately 66 pounds/30kg of warheads. Additionally, Hezbollah are known to possess a considerable number of more advanced and longer range missiles. During the 2006 war Hezbollah fired approximately 4,000 rockets (95% of which were Katyshas) all utilizing only "dumb" high explosive warheads. Some Iranian build and supplied Fajr-3 and Ra'ad 1 liquid-fueled missiles were also fired. It is believed that the larger and longer range missiles are directly under the control of Syrian and Iranian officers.
The combination of short to medium range rockets and guided missiles in Lebanon, and the longer range guided missiles in Syria, the smaller number of rockets and missiles in the West Bank and Gaza, and the longer range guided missiles in Iran present a massive throw weight of warheads aimed at Israel.
The 2006 Israeli-Hezbollah War (called the Second Lebanon War in Israel) was an attempt by Israel at eliminating the MAD counter-force in Lebanon. It was an attempt that failed. The Syrians had purchased (and supplied to Hezbollah) a large number of very nasty, relatively low cost Russian AT-14 Kornet solid fuel anti-tank guided missiles and the Iranian trained Hezbollah commandos dug in massive numbers of concrete bunkers and firing positions. After over 50 Merkava main battle tanks were hit, and the high tech American made warplanes and pinpoint weapons proved ineffective, the handwriting was on the wall. Either use neutron bombs or lose a large number of Israeli solders to remove the Hezbollah threat; or declare peace and walk away for the time being - the Israelis chose the latter.