Exercise

A military exercise is the employment of military resources in training for military operations, either exploring the effects of warfare or testing strategies without actual combat [BabelNet].

It is a systematically organized repetition of specific techniques and actions (mental and practical), knowingly complicated, to develop and improve servicemen's skills necessary to perform service and combat tasks. It is a systematically organized, consciously conscious repetition of specific complicating actions and techniques to form, consolidate and improve servicemen's practical skills [Словник професійної термінології для майбутніх фахівців Національної гвардії України].
In a practical sense, drill consolidates soldiers into battle formations and familiarizes them with their weapons. Psychologically, it develops a sense of teamwork, discipline, and self-control; it promotes the automatic performance of duties under disturbing circumstances and instinctive response to the control and stimulus of leaders.
The modern drill is essential of two types: close-order and extended-order, or combat drill. Close-order drill comprises the formal movements and formations used in marching, parades, and ceremonies. Combat drill trains a small unit in the looser, extended formations and movements of battle [Online Encyclopedia Britannica].

Sources:

Drill. Online Encyclopedia Britannica. Retrieved from: https://www.britannica.com/topic/drill-military.

Military exercise. BabelNet. Retrieved from: https://babelnet.org/synset?id=bn%3A00375140n&orig=military%20exercise&lang=EN.

Блінов, О. А., Вовк, М. П., Молдавчук, В. С., Троцький, Р. С., Чуприна, О. В., & Шепель, С. І. (2016). Вправа. Словник професійної термінології для майбутніх фахівців Національної гвардії України. Київ: НАВС України. Retrieved from: http://elar.naiau.kiev