While amphibious operations have historically straddled single service prerogatives and had been conspicuously avoided prior to World War II, in the Pacific area of operations during World War II such operations were abundant, decisive and generally regarded as models of joint service cooperation. Under the legendary General Douglas MacArthur, the Philippine Campaign in 1944-45 was especially noteworthy as a model of a single flexible strategy, unity of command, and joint service cooperation. Yet forty-five years later, our national military experience in joint planning and operations has appeared to regress. The recent Goldwater-Nichols Department of Defense Reorganization Act of 1986, however, has elevated service interest in joint planning and operations. This study briefly discusses the Mindanao Operation (March-July 1945), one of several operations within the Philippine Campaign. The study focuses on the impact of existing joint doctrine on the planning, coordination and execution of operations and evidence of joint action to solve some specific and unique challenges encountered within the operation. A summary of the Mindanao operation and appropriate comments on its applicability as a model for today’s joint operations complete this study.