The National quotes Brent Scowcroft Center Senior Fellow for Middle East Security Bilal Y. Saab on the logistics of creating and implementing a shared missile defense system among Gulf Cooperation Council (GCC) states: 

Fellow GCC states were wary of Saudi Arabian dominance when Riyadh suggested a common security force and a monetary union. The group’s members also do not take a uniform position on Iran, as they all perceive the threat it poses in different ways. A shared missile defence system would entail sharing intelligence and coordination among national security agencies and, in effect, an outsourcing of vital responsibility and suspension of sovereignty that would be difficult for any country to institutionalise. “GCC nations do not agree on what such a system should look like and they do not share nearly enough information,” said Bilal Saab, an expert on the US-Gulf security relationship at the Atlantic Council think tank.

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Even if there was agreement on integration, it would not be as simple as coordinating defence purchases. Effective integration also requires the creation of strategic institutions for “thinking collectively about concepts of operations, and tactics, techniques and procedures”, Mr Saab said. “But none of that is happening today”, in Washington or the Gulf.

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