“There was an exchange of fire at the entrance to the base after an attempt by the trainers’ vehicle to enter the gate without heeding orders of the guards to stop,” a Jordanian military source said.
The base has been temporarily closed since the incident.
Jordanian state news agency, PETRA, said the incident took place at the Prince Faisal Air Base in the al-Jafr area south of Jordan’s capital of Amman, RT reported.
Another US serviceman and one Jordanian officer were also injured in the incident.
Relatives of the injured Jordanian officer have gathered at the entrance to the base, while the Jordanian army sent reinforcements to the facility citing security concerns.
Jordanian security services have launched an investigation into the incident.
Jordan has a close relationship with the US and is one of its and NATO’s major allies in the Middle East.
Jordan has received more than $13 billion in assistance from the US since the establishment of diplomatic relations between the two countries more than six decades ago.