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.
The battalion is the smallest unit to have a staff of officers (in charge of personnel, operations, intelligence, and logistics) to assist the commander. Several battalions form a brigade, which has 2,000 to 8,000 troops and is commanded by a brigadier general or a colonel.