In the US Navy, the O-10 rank is the 4 star Admiral, and the O-11 rank used to be the 5 star Fleet Admiral (FADM). The FADM rank was established in 1944 in order to give US military officers comparable ranks to five-star officers of allied nations. There have only ever been 4 FADMs, with 3 towards the end of World War II and 1 immediately after.
William Leahy, Ernest King, and Chester Nimitz were promoted to FADM in December 1944, on the 15th, 17th, and 19th, respectively. This timing was carefully planned, per wiki, in order to establish a clear order of seniority and a near-equivalence between the services for the Generals of the Army promoted at the same time. William Halsey picked up FADM on 11 December 1945.
Chester Nimitz, Commander in Chief of the US Pacific Fleet, and Commander in Chief of the Pacific Ocean Areas, was the last of them when he died in 1966 in San Francisco. He rests near San Francisco, at the Golden Gate National Cemetery in San Bruno.
(Hmmm, I was just there last month, my first time ever, visiting the grave of Marine Lance Corporal Travis J. Layfield, KIA on 06 April 2004 during Operation Iraqi Freedom in Iraq’s Anbar province. I am friends with his mother, Dianne.)
On Treasure Island in San Francisco, Chester Nimitz lived there during the latter part of his life. He actually lived on YBI, Yerba Buena Island, and not on TI where I was stationed. The house is now called The Nimitz House and it sits directly underneath the new(-ish) eastern span of the Bay Bridge, at DD coordinates given by ▲ 37.8127, -122.3636. Its address is Naval Quarters 1 Nimitz House, 1 Whiting Way, San Francisco, CA 94130.
That eastern span of the Bay Bridge opened on Monday 02 Sep 2013, and my wife and I were among the very first to drive across it that day.