Jordan is hosting a competition of elite anti-terrorism squads from 18 countries, including fellow members of the military coalitions fighting rebels in Yemen and Islamic State extremists in Iraq and Syria.
The 7th Annual Warrior Competition offers a chance for team leaders to "meet and to know each other, as the terrorists have become international", according to Colonel Khaled Abu Hamad.
The competition, which involves 10 events, opened with a drill by Jordanian special forces rescuing hostages from a plane and rappelling from a helicopter.
Among those participating are the US, Russia, China, Saudi Arabia and Afghanistan. China won the competition last year.
Jordan is a member of a US-led military coalition against Islamic State militants. It also supports a Saudi-led campaign against rebels in Yemen.