Final answer:
On 28 April 1967, Delbert Black became the first Master Chief Petty Officer of the Navy, the highest enlisted rank and senior enlisted advisor in the U.S. Navy. The role was established not long after the significant contributions of Admiral Chester Nimitz during World War II.
Step-by-step explanation:
On 28 April 1967, Delbert Black became the first Master Chief Petty Officer of the Navy. This position represents the highest enlisted rank in the U.S. Navy and the senior enlisted advisor to the Chief of Naval Operations. The establishment of the role of Master Chief Petty Officer of the Navy (MCPON) occurred during a significant period in naval history, just years after Admiral Chester Nimitz, as the Commander of the U.S. Pacific fleet during World War II, was promoted to Fleet Admiral. Nimitz played a crucial role in the war effort and ultimately accepted the surrender of Japanese forces aboard the USS Missouri, marking the end of World War II in the Pacific.