Starting in the late 1970s and. continuing for decades, an increasing amount of the. protective layer of stratospheric ozone above Antarctica. would disappear during late September and October, cre-. ating what is popularly known as the ozone hole.
A battalion is a military unit. The use of the term battalion varies by nationality and branch of service. Typically a battalion consists of 300 to 800 soldiers and is divided into a number of companies. A battalion is typically commanded by a lieutenant colonel. In some countries the word battalion is associated with the infantry. The term was first used in Italian as battaglione no later than the 16th century.
A company typically has 100 to 200 soldiers, and a battalion is a combat unit of 500 to 800 soldiers. Three to five battalions, approximately 1,500 to 4,000 soldiers, comprise a brigade. The size of a division varies from about 10,000 to 18,000 soldiers, and most divisions have three or more brigades of roughly equal size.