I once asked a friend of mine who was in the Army who was the greatest, most capable officer ever associated with the US Military. He said without hesitation, "General George Marshall." Churchill wrote this too him after the war. He was truly a great man.
“It has not fallen to your lot to command the great armies. You have had to create them, organise them, and inspire them. Under your guiding hand the mighty and valiant formations which have swept across France and Germany were brought into being and perfected in an amazingly short space of time. . . . You have been the mainspring of that marvellous organisation, the Combined Chiefs of Staff, whose conduct and relationship will ever be a model for the planning and supervision of Allied and Combined operations. There has grown in my breast through all these years of mental exertion a respect and admiration for your character and massive strength which has been a real comfort to your fellow-toilers, of whom I hope it will always be recorded that I was one.” (Churchill to Marshall, May 17, 1945)
That's a great post. He's condemned to have his name known to posterity without the man himself being recognised as he should.