You may recall Col. Morris Davis from an earlier dust-up. Davis was the prosecutor who accused a military defense lawyer (Michael Mori) of acting unethically by disparaging the Gitmo military tribunals during a press tour through Australia. Davis was vilified and some suggested he himself should be sanctioned for unethical conduct. Indeed, Mori's side fired back at Davis in court papers.
Davis recently resigned from the military commission process, saying that they had been politically compromised. Now it appears that Davis is willing to testify on behalf of one of the detainees, to prove up the allegations of political interference. Stories at Volokh and Opinio Juris. It's not clear to me exactly what the expected testimony would be, or if it would be deemed relevant and admissible. Perhaps there will be a proffer and/or motion in limine that will give us more details.