The Army considered the Navy FINISHED because of the possible effects of atomic bombs on ships.
What did they think would happen to airplanes?
One of the most poignant passages of Churchill's history is reciting a very candid letter to Roosevelt describing in detail how Britain was broke and unable to continue the war on a cash basis. IIRC, Roosevelt was on a ship and spent a lot of time re-reading the letter and thinking. His brainstorm was Lend-Lease. I suppose Truman was privy to none of that history, but suddenly cutting off aid meant some hard years for Britain.
For a time the Brits carried the torch of Western Civilization all alone and in my opinion deserved some consideration for that.