Would the military remain efficient or even improve without officers? Keep it professional gentlemen!

Regardless of whether there were officers, someone would step in to fill that policy making role - it is just human nature. If we took a bunch of E-1's and isolated them, you could come back in a few weeks and find someone acting as the officer and several as varying levels of NCO. Try reading "Lord of the Flies" for an excellent literary example.

In a word, no.
Officers have their job - plan, prioritize, and resource.
Enlisted personnel have theirs - train and execute.

While I have done plenty of "officer business" over the years, I'll be damned if they ever do mine. I am thankful that I have officers to deal with politics, planning, and dealing with meetings so I can accomplish the necessary tasks that make my company go. I've gone without; it is not better.

No.