U.S. Army Maj. Gerardo Grau DeLeon (right), U.S. Army Cyber Command Cyber Defense Operations Center officer in charge, provides an overview of U.S. Army Cyber Command to Col. Luis P. Guimpel, Argentine Army Cyber Command commander, and other Argentine cyber officers May 10 at the Argentine Army Cyber headquarters in Buenos Aires, Argentina. Personnel from U.S. Army South coordinated this three-day subject matter expertise exchange with U.S. Army Cyber Command and the Argentine Army Cyber Defense Directorate to share best practices in cyber defense and build cyber program interoperability.