A just-published report on Israel and the United States’ interception of Iranian missiles during the 12-day Israel-Iran war highlighted the Jewish states’ dependence on US military support.

The report by the Jewish Institute for National Security of America (JINSA) concluded that US-operated Terminal High-Altitude Area Defence or THAAD air defence systems, produced by Lockheed Martin, accounted for almost half of all interceptions of Iranian missiles fired at Israel during the war.

The US positioned a second of its seven THAAD systems and crew in Israel in April. The US deployed the first system last October.

A THAAD battery, one of the United States’ most powerful anti-missile systems, typically deploys with 95 soldiers, six truck-mounted launchers, 48 interceptors (eight per launcher), and a mobile radar.

The system intercepts incoming projectiles from up to 200 kilometres away with kinetic energy, in a process often referred to as “hit-to-kill,” or “kinetic kill.”

The Institute’s report suggested that Israel depended on THAAD because it lacked sufficient interceptors for its Arrow anti-ballistic missile system.

The United States expended more than a year’s worth of THAAD interceptor production in the Israel-Iran war at a cost of US$12.7 million per interceptor, or US$1.7 billion for the approximately 100 interceptors fired during the war.

"As a result, the United States used up about 14 percent of all its THAAD interceptors, which would take three to eight years to replenish at current production rates,' the report said.

The Institute's Iran Projectile Tracker reported that the United States and Israel had successfully neutralised 201 of the 574 missiles fired by Iran during the war, with 316 landing in unpopulated areas.

Israel has admitted that Iranian missiles had pierced its air defence systems, striking at military targets and residential areas.

In a twist of irony, Iran increased its successful hit rate by one to four per cent in incidents when they were confronted by THAAD interceptors, the Institute’s report said, based on analysis of video shot by Amman-based photographer Zaid Abbadi.

Even so, the Institute argued that air defence support of Israel in the war served US interests beyond coming to the aid of an ally.

"This strong support of a US partner may also reinforce US. deterrence against Russia and China," the report said.

What the report did not say is that it also demonstrated the degree to which Israel depends on the United States for its defence, despite the ruthless prowess of the Israeli military and the sophistication of the country's military-industrial complex.