Command Sgt. Maj. Trevor C. Walker speaks at the 34th cycle of the Conference of American Armies at Joint Base San Antonio-Fort Sam Houston Feb. 9. The CAA was established in 1960 in order to strengthen ties across the Western Hemisphere and combat communism. U.S. Army South plays a key role as the U.S. Army's lead agent and CAA liaison responsible for all coordination with partner nation Armies.