So, why did Ike bust the General back to colonel?

Thanks. I would have always been wondering.

So much history is NOT on the internet. Just finished Toland's book on Korea and there were two brothers (WWII USMC vets) who were film shooters for NBC. Can't find info on them anywhere. That would be a heck of a good story.

Internet information on Wikipedia is the source of this information. After World War II came the vast reduction in the size of the Army. I've known about the involuntary rank reductions for a long time. There was a real old guy still working in my office back in 1992. He told me that he had heard of a Army full colonel being administratively reduced to the rank of master sergeant after WWII. I believed him. In Marine Corps history, Medal Of Honor recipient, Major Jesse Folmar, known for shooting down a Russian-built MiG 15 fighter jet with his Vought F4U-D, propeller Corsair fighter, was given the choice of keeping his captain's rank after World II but being involuntarily transferred to the Marine tank force, or remaining a fighter pilot but accepting the rank of master sergeant. Folmar chose to become a master sergeant. He later regained his commissioned officer's rank and retired as a major.
Most people think rank reduction is something bad and mostly they're right. But the military does retain its option of administrative rank reduction which is supposed to be a generous option to remaining employed and in the military as opposed to being discharged and unemployed. It would have been unthinkable for the post-WWII Army to fire all those 212 generals. But the war was over and the U.S. Army didn't need 80 divisions. Assuming a division commander of a major general and an assistant division commander, a brigadier general, that's a total of 160 generals. More generals existed at the corps and army level, including non-combat generals and it's easy to see how many generals existed at war's end. So all those generals were given a rank reduction to full colonel, for which there were more jobs available within the reduced army. Or else the generals could elect to leave or retire, which I'm sure many did for a lucrative job in the civilian sector.
Hollywood took a liberal slap at Bonner Fellers. At the movie's end, the credits make it look like brigadier general Fellers did something wrong to deserve his demotion at the hands of President Eisenhower. If Wikipedia is accurate and I'm sure it is, Fellers was only one of those 212 generals who had to take the demotion or else retire or resign. You see, Bonner Fellers later became a member of the conservative political group, the John Birch Society. Liberal Hollywood was going to make sure it threw a mudpie at the memory of Fellers at movie's end before the audience felt too much sympathy for him.

Right. The ending leaves us with a complicate idea