Over 40,000 people will be involved in the upcoming “Exercise Trident Juncture 2018” this year. The purpose of the event will be to bolster defense efforts against “any threat, from any direction, at any time,” said Navy Adm. James G. Foggo III. The announcement was made in Brussels at the NATO headquarters, and the exercise will span from Oct. 25 to Nov. 7. Norway will be the host nation.

Over 30 Allied nations will be involved in the NATO exercise, though NATO itself only has 29 member states. NATO nations in particular are bound to one another — their Article 5 states that an attack on one country is an attack on the rest. Article 5 was invoked after the terrorist attacks on the United States on 9/11, which spawned immediate action from 13 NATO nations (the first use of Article 5 in NATO’s history). Bolstering readiness and response in the spirit of Article 5 is the primary goal of this exercise.

Exercise Trident Juncture 18 will employ military units in the air, on the water and on the ground. Prior to the official start date, some naval exercises will be conducted off the coast of Iceland in mid-October.

This operation will test and increase tactical skills on both an individual and a mass level, and in an unforgiving environment. “Statistically, there will be rain and/or snow and wind. And, there actually might be a lot of it,” said Norwegian navy Vice Adm. Ketil Olsen.