"intense vetting"
In the 2018 fiscal year, some 62,700 foreign military students from 155 countries participated in U.S.-run training, the total cost of which was approximately $776.3 million, according to DoD records.
Among them is a contingent Saudis who recently arrived at Naval Air Station Pensacola.
In recent weeks, 18 naval aviators and two aircrew members from the Royal Saudi Naval Forces were training with the U.S. Navy, including a stint at Pensacola, according to a November 15 press release from the Navy.
It was not clear if the suspected shooter was part of that delegation.
The delegation came under a Navy program that offers training to U.S. allies, known as the Naval Education and Training Security Assistance Field Activity.
A person familiar with the program said that Saudi Air Force officers selected for military training in the United States are intensely vetted by both countries.
"intense vetting"