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KUWAIT CITY, KUWAIT - SEPTEMBER 10: (----EDITORIAL USE ONLY MANDATORY CREDIT - " DEFENCE MINISTRY OF QATAR / HANDOUT" - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS----) Kuwait's army chief of staff Lt. General Mohammad al-Khoder (C), Oman's armed forces chief of the staff Lt. General Ahmad Bin Harith al-Nabhani (4th L), Commander in chief of Bahrain's defence force Marshal Sheikh Khalifa Bin Ahmad al-Khalifa (3rd R), Qatari armed forces Chief of the staff Major General Ghanem Bin Shaheen al-Ghanem (3rd L), United Arab Emirates armed forces chief of the staff Lt. General Hamad Mohammed Thani al-Rumaithi (2nd R) and Saudi chief of the staff, Major General Fayyadh bin Hamid bin Ragad al-Ruwaili (4th R), pose for a photo during a meeting for the chiefs of staff of the six Gulf Cooperation Council (GCC) states in Kuwait City on September 10, 2018. (Photo by DEFENCE MINISTRY OF QATAR / HANDOUT/Anadolu Agency/Getty Images)

KUWAIT CITY, KUWAIT - SEPTEMBER 10:  (----EDITORIAL USE ONLY  MANDATORY CREDIT - " DEFENCE MINISTRY OF QATAR / HANDOUT" - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS----)  Kuwait's army chief of staff Lt. General Mohammad al-Khoder (C), Oman's armed forces chief of the staff Lt. General Ahmad Bin Harith al-Nabhani (4th L), Commander in chief of Bahrain's defence force Marshal Sheikh Khalifa Bin Ahmad al-Khalifa (3rd R), Qatari armed forces Chief of the staff Major General Ghanem Bin Shaheen al-Ghanem (3rd L), United Arab Emirates armed forces chief of the staff Lt. General Hamad Mohammed Thani al-Rumaithi (2nd R) and Saudi chief of the staff, Major General Fayyadh bin Hamid bin Ragad al-Ruwaili (4th R), pose for a photo during a meeting  for the chiefs of staff of the six Gulf Cooperation Council (GCC) states in Kuwait City on September 10, 2018.  (Photo by DEFENCE MINISTRY OF QATAR / HANDOUT/Anadolu Agency/Getty Images)