The men in charge of military operations for WWII thought that use of the atomic bomb in those two instances was not necessary. Adm. William Leahy, Gen. Douglas MacArthur, Gen. Curtis LeMay, Gen. Henry Arnold, Brig. Gen. Bonner Fellers, Adm. Ernest King, Gen. Carl Spaatz, Adm. Chester Nimitz, Adm. William "Bull" Halsey, and Eisenhower all disagreed with Truman's call to bomb Japan with nuclear arms.
The heads of all branches of the military did not want to use the atomic bomb on Japan.