https://en.wikipedia.org/wiki/Dominion_(manga)

Dominion (ドミニオン Dominion) is a Japanese manga written and illustrated by Masamune Shirow. Set in the fictional city of Newport, Japan, in a future in which bacteria as well as air pollution have become so severe that people must wear gas masks when outdoors, the series follows a police squadron that uses military-style tanks.

Dominion has been adapted into three original video animation series: the first was released in 1988, the second, New Dominion Tank Police (特捜戦車隊ドミニオン Tokusō Sensha Tai Dominion) in 1993 and the third, Tank Police Team TANK S.W.A.T. 01 (警察戦車隊ＴＡＮＫＳ．Ｗ．Ａ．Ｔ．０１ Keisatsu Sensha Tai TANK S.W.A.T. 01) in 2006. The 1988 OVA is four volumes long and animated by Agent 21, The 1993 OVA is six volumes long and animated by J.C.Staff while TANK S.W.A.T. is one volume long and animated by DOGA Productions.

Additional links:

• Official website (Japanese)
• Wikia
• MyAnimeList
• Anime News Network
• TV Tropes