States also have their national guardsmen, does that mean it's a good idea to disband the army?

Yes - and states actually control much of the curriculum.

However, the DOE does things like make sure there is funding for children with additional needs, which lets be honest, are not going to be replicated in certain states if the DOE is indeed disbanded.

Does this mean there is no value in maintaining federal education standards, or do we want to let states decide if they want to abolish theirs as well?