Do you think we should withdraw combat troops from Afghanistan and leave training forces there?

The talk now, immediately after a US soldier went off the deep end and murdered 16 Afghan civilians, is ending our commitment in Afghanistan by the end of 2014, but withdrawing all combat troops by next year and leaving only trainers there. Now I may not be Sun Tzu, but even I can see that trainers without any combat forces to shield them would be sitting ducks waiting for the next rouge Afghan soldier, or policeman, or Taliban suicide bomber to kill them.

Am I missing something, or are the vaunted “commanders on the ground” a bunch of unrealistic idealists, or worse, political hacks?