I don't think they need it at the moment, they need bigger army and bigger landmass. GCC military alliance is needed for them to pack more punch and deter bigger threats. I don't see any initiative within the GCC to create that, seems UAE-Saudi are the closer two and even they have disagreements on the ground.
You can't get F35 and be passive country with passive security policies. And without serious experience like UK has from previous wars.
What is the GCC?
Main security agreements
In 1984, the GCC established a standing coalition land force, the
Peninsular Shield Force, tasked to defend the six nation states. It is composed of infantry, armour, artillery and combat support elements from each of the states, numbering 40,000 in total.
The
1994 GCC Security Agreement explicitly prohibited illegal arms trading and promoted using the newest technologies to combat arms trafficking.
The
2000 Joint Defence Agreement was signed to develop a joint military industry for arms manufacturing.
The
2004 GCC Counter-Terrorism Agreement was adopted, and two years later, a permanent committee on "terrorism" was founded.
In November 2012,
Kuwait became the last member state to ratify the
Internal Security Pact at the GCC summit in Bahrain. It called for closer coordination of internal security and surveillance policies, in addition to greater information sharing and unified plans for joint actions.
The pact was initially introduced in 1982, then again in 1994, when it was approved by
Saudi Arabia, Bahrain and Oman. Qatar and the UAE later followed suit.
https://www.aljazeera.com/news/2017/12/gcc-171204094537378.html
