High Quality Content by WIKIPEDIA articles! The United States Army Chemical Materials Agency (CMA) is a major sub-command of the United States Army Materiel Command (AMC) and a reporting element of the United States Assistant Secretary of the Army for Acquisition, Logistics, and Technology. Its role is to enhance national security by securely storing and ultimately eliminating U.S. chemical warfare materiel, while protecting the work force, the public and the environment to the maximum extent.