ROCK ISLAND ARSENAL, Ill. -- The Department of the Army announced the reassignment of three members of the Senior Executive Service (SES) stationed at Rock Island Arsenal.Melanie Johnson, who served as executive director of the U.S. Army Contracting Command-Rock Island (ACC-RI), moved over to the U.S. Army Joint Munitions Command (JMC) to serve as deputy to the commander, effective Nov. 27.Johnson's position as executive director of ACC-RI was filled by Jay Carr, who served as executive director of the Acquisition Integration and Management (AIM) Center at the U.S. Army Sustainment Command (ASC).The position of AIM executive director was filled by Carl Cartwright, who served as executive director of the Support Operations (SPO) Center at ASC.Members of the Senior Executive Service serve in the key positions just below top presidential appointees. SES members, who work throughout the Department of Defense and other federal agencies, are the major links between these appointees and the rest of the federal workforce.Johnson began her career in contracting at Rock Island Arsenal in 1981 and has over 35 years of acquisition experience. Her past assignments include serving as the Director of Field Support Contracting and Army Sustainment Command Executive Officer. She has also held various other contracting assignments for the execution and management of facilities and production contracts for conventional ammunition produced at commercial facilities, government-owned, contractor-operated installations, and government-owned, government-operated installations; as well as non-standard ammunition for foreign military sales in support of the Afghanistan and Iraq missions. She was appointed as an SES member in 2013.Carr, who was also appointed as an SES member in 2013, served in a number of key leadership positions at ACC-RI and its predecessor organizations from 2004 to 2013, when he came to ASC as executive director of the Logistics Civil Augmentation Program (LOGCAP). His other past assignments include serving as chief of contracting for the Rock Island District of the U.S. Army Corps of Engineers and as executive director for support in the Office of Security Cooperation at the U.S. Embassy in Baghdad, Iraq.Cartwright, who first became an SES member in 2009, was a career Army officer who retired at the rank of colonel. His past assignments include serving as executive director for ASC's commanding general and as deputy commander of ASC.