Disclaimer: I have no evidence to support this other than knowing how the military (bureaucratic) mind works.

Let's suppose the military is tired of being sent into places they aren't welcome to stand between two (or more) groups of people fighting over who gets to hold our economy hostage to our oil dependancy.

Let's further suppose that high-ranking people in the military have discussed privately the obvious fact that political considerations force us to ally ourselves with people who would be in prison in any civilized country for what they do to half their population.

Now, how do military people (bureaucrats) fight back against resulations with which they disagree? By enforcing the letter of the regulation beyond all reason. For example, when some local commander (true story) writes a regulation that camouflage uniforms can not be worn if they have been torn and repaired, enforce it strictly and rigorously until the commander gets dozens of complaints per week from infantrymen who have been told they have to buy $300 of new uniforms. Keep it up until the commander either repeals the reg or writes an exception to it.

Basically, you can't be disciplined for overzealous enforcement of a regulation. But, you absolutely can not state publicly what you are doing. You'd be up for insubordination.

So if you've been ordered into a country that despises us, to defend people you would rather prosecute for human rights violations, how do you protest? You could always enforce the local regulations with which you disagree. If this causes people back home to take note of the local injustice, well, that's not your fault. You're just trying to get along with your hosts. Of course, you could never admit to this, so you'd just have to keep your mouth shut and let the situation play itself out in the press.