Humberto Mendoza's testimony was not completed:

The General Court Martial of SSgt Frank D. Wuterich was recessed unexpectedly without explanation in the middle of the cross-examination of squad member Humberto Mendoza.

Mendoza was expected to testify he heard Wuterich order his ad hoc fire team to mount an unlawful assault on two houses that held civilians.

During his examination by government prosecutor Lt Col Sean Sullivan, however, Mendoza testified he never heard Wuterich give any orders to assault the houses where 14 civilians were killed.
And so, a possible deal:

Camp Pendleton, Calif. – Defend Our Marines has learned there is a possible deal in the works to end arguably the most divisive court-martial in Marine Corps history. Sources have confirmed that defense counsel Neal Puckett and and lead prosecutor Maj. Nicholas Gannon have entered into "conversations" to have the case resolved. The military judge, Lt Col David Jones, told the lawyers Wednesday afternoon after unexpectedly recessing the trial that he would be available for "consultation" until 0800 tomorrow morning when court is scheduled to resume.

A source close to the trial said a lack of money on the defense side, a lack of evidence on the prosecution side, and the likelihood that the eight-member panel will find SSgt Frank Wuterich not guilty of voluntary manslaughter and related charges have all combined to bring the case to a possible conclusion.
Wouldn't doubt it; but what kind of deal (some form of "dereliction of duty") ?

Regards

Mike