Currently, there has been no official explanation for the dropping of charges against Tatum, but there is speculation that he may be called to testify in the court martial trial of his squad leader at the time of the incident.
The government has been trying to compel Tatum to testify against his squad leader, Staff Sgt. Frank Wuterich. In recent weeks, it offered Tatum testimonial immunity – meaning that anything Tatum said during Wuterich's trial couldn't be used as self-incrimination.
Wuterich and Tatum are part of the Camp Pendleton-based 3rd Battalion, 1st Marine Regiment. A roadside bomb struck their unit's convoy Nov. 19, 2005, in Haditha, killing one Marine and wounding two others.
The investigation in the Haditha shootings and bombing are still under investigation, and have been covered extensively here at Wake Up America:
al-Qaeda Planned the Whole Haditha Massacre
Haditha Marines, John Murtha and the New York Times
Haditha Marines: Judge Orders John Murtha to testify in defamation case
Another Haditha Marine Exonerated-Still No Apology From Murtha
Haditha Marine, Col. Jeffrey Chessani to Sue John Murtha
Haditha Investigator:Drop Marine murder case
So far there is STILL no apology from John Murtha.
Once and Always, an American Fighting Man
[Update] More from Let Freedom Ring.