LGEN Ernest T. Cook Jr., right, commanding general, Marine Corps Combat Development Command (MCCDC) transfers the organization color to LT. GEN. Walter E. Boomer during the MCCDC change of command ceremony. Cook has been commanding general since August 1, 1990 and is retiring today. Boomer was promoted to LT. GEN. on August 8, 1990 and assumed duties as commanding general, 1 Marine Expeditionary Force (1 MEF), and commanding general, Marine Corps Base, Camp Pendleton, Calif