There indeed were moves to vastly reduce the armed services, particularly the Navy and the Marines, but of course not the Air Force, under the mistaken assumption that nuclear weapons had made conventional warfare obsolete.
Truman was soon to learn the error of that assumption in Korea. He apologized in writing to the Marine commandant, and then in person at the Marine Corps League meeting in September of 1950, less than two weeks before the Inchon landing, which he must have known was in the works.
And btw, he received a standing ovation from the Marines, at least according to Wikipedia:
"He made amends only by making a surprise visit to the Marine Corps League a few days later, when he reiterated, “When I make a mistake, I try to correct it. I try to make as few as possible.” He received a standing ovation."
And I think there may have been some servicemen, including Marines, that approved of Truman's decision to use the atomic bombs, saving hundreds of thousands, maybe a million American casualties.