Paul Hanna/REUTERS
Spanish troops drive a Cougar armored reconnaissance vehicle while taking part in Exercise Trident Juncture 2015, NATO's largest joint and combined military exercise in more than a decade, at the San Gregorio training grounds outside Zaragoza, Spain, November 4, 2015
The exercise, called Trident Juncture 2015, includes approximately 36,000 troops, over 140 aircraft, and 60 ships from more than 30 nations.
The exercise's participants include both NATO countries and nations that are close with the various NATO states without officially being part of the alliance, such as Australia, Austria, Finland, and Ukraine.
Trident Juncture is taking place entirely in the western Mediterranean, with the majority of the exercise occurring in Spain and Portugal, as well as in Italy. The operation will last until November 6.
We have collected some of the most amazing images of the exercise so far below.