@Fishmoto37:
I dont think that the technology for deploying nuclear devices with artillery existed in this time frame.
Not in 1951, though soon thereafter. The earliest such weapon in the U.S. arsenal was the nuclear-capable MGR-1 Honest John free-flight surface-to-surface rocket; it was first tested in 1951 and the first production rounds were delivered in January 1953. It was originally outfitted with a W7 variable yield nuclear warhead with a yield of up to 20 kilotons, and later a W31 warhead. The next U.S. tactical nuclear system, the M65 Atomic Cannon (“Atomic Annie”), which could deliver 280mm W9 and W19 nuclear shells, was test-fired for the first time with a live nuclear round (a 15 kiloton W9 warhead) on May 25, 1953. It was deployed that same year in Europe and Korea.
At any rate, even if these tactical nukes had ben available for deployment in 1951, the JCS would probably have been even more nervous about transferring their control to the military than they already were about the Mark 4 nuclear bombs. As land-warfare systems, they would have operated under Army rather than Air Force supervision, which might have increased the potential of MacArthur using them.