AR Governmental & Military Abbreviation

Argon

Argon is a chemical element with symbol Ar and atomic number 18. It is in group 18 of the periodic table and is a noble or inert gas. Argon is the third most common gas in the Earth's atmosphere, at 0.93% (9,300 ppm). 

Army Regulation

Airman Recruit

Army Records

Army Reserve

Authentication Request

Acknowledgement of Receipt

A notification relating to the receipt of e.g. goods, messages and documents.

Alaska Region

Architecture

Architecture is both the process and the product of planning, designing, and constructing buildings and other physical structures.