During the Korean War the left backed the POTUS over the General. Today the left backs the Generals over the POTUS. In each case they backed the weaker less assertive American policy. Truman's reluctance to take on the Chinese (weak) they backed. Opposing Bush on IRAQ invasion (strong).
That has nothing to do with the issue of civilian control of the military.
In the first case they were right, in the second wrong, as regarding civilian control of policy.