LGEN Walter E. Boomer, left, commanding general, Marine Corps Combat Development Command (MCCDC), and LT. GEN. Ernest T. Cook Jr., stand at attention as units pass in review during the MCCDC change of command ceremony. Boomer relieved Cook, who was commanding general from 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