沃克死亡時的中將軍銜是戰時（臨時）軍銜；追授的上將是永久軍銜。

Source – Official Register of the United States Army. 1946. pg. 713

No insignia	Cadet, United States Military Academy: June 15, 1907
No pin insignia in 1912	Second Lieutenant, Regular Army: June 12, 1912
	First Lieutenant, Regular Army: July 1, 1916
	Captain, Regular Army: May 17, 1917
	Major, National Army: June 7, 1918
	Lieutenant Colonel, National Army: May 6, 1919
	Captain, Regular Army: February 12, 1920
	Major, Regular Army: July 1, 1920
	Lieutenant Colonel, Regular Army: August 1, 1935
	Colonel, Army of the United States: February 14, 1941
	Brigadier General, Army of the United States: July 10, 1941
	Major General, Army of the United States: February 16, 1942
	Colonel, Regular Army: May 1, 1942
	Lieutenant General, Army of the United States: April 15, 1945
	Major General, Regular Army: August 1, 1947
	General, Regular Army (posthumous): January 2, 1951[18]