CIMSEC – One of the U.S. Marine Corps’ greatest strengths has been a weakness of late. Its storied history and rich service culture make it an organization notoriously resistant to critical self-examination and change. If “man cannot remake himself without suffering, for he is both the marble and the sculptor,” then the Marine Corps is particularly fond of its own marble and sensitive to the chisel.¹ Such a fondness explains the spate of articles from retired Marine Corps leaders criticizing the “hasty” execution of 2019 Commandant’s Planning Guidance (CPG) and lamenting they sacrifice critical aspects of the Marine Corps combined arms heritage.