Final answer:
AR 600-20 is an Army Regulation that covers the topic of Army Command Policy.
Step-by-step explanation:
The abbreviation 'AR' stands for Army Regulation. AR 600-20 is a specific Army Regulation that covers the topic of Army Command Policy. It provides guidance and regulations for the command, management, and administration of the Army, including areas such as military discipline, equal opportunity, and the chain of command.