Go read the letter from Captain Ian Fishback (82nd Airborne) to Senator John McCain urging the government to clarify its position with regard to how detainees in US custody should be treated. Here’s how it starts:
I am a graduate of West Point currently serving as a Captain in the U.S. Army Infantry. I have served two combat tours with the 82nd Airborne Division, one each in Afghanistan and Iraq. While I served in the Global War on Terror, the actions and statements of my leadership led me to believe that United States policy did not require application of the Geneva Conventions in Afghanistan or Iraq. On 7 May 2004, Secretary of Defense Rumsfeld’s testimony that the United States followed the Geneva Conventions in Iraq and the “spirit” of the Geneva Conventions in Afghanistan prompted me to begin an approach for clarification.
You can also read Captain Fishback’s account (along with the accounts of two 82nd Airborne sergeants) in a Human Rights Watch report.