Arabic term (edited): ���� �����

You did not provide sufficient context, so it is not clear how the term is being used in the material you are translating. However, in English language material about Egyptian military justice, the prosecution side is simply referred to as the "prosecutor." The modifier "military" may be added for the sake of clarity, but it is not essential. See the following:

http://weekly.ahram.org.eg/2002/568/eg6.htm

I assume the modifier نائب refers to a deputy position.

In the U.S., current military justice terminology is the outcome of a long and complicated history that has resulted in some very peculiar terms that should not be used in non-U.S. contexts, except by way of explaining to a U.S. audience some parallels (if that is the purpose of the material you are translating). One such term is JAG (judge advocate general), which simply means a lawyer for the military. The term applies to those working on the prosecution side, the defense side, or even those who are not involved in any litigation. In any case, it should not be used in non-U.S. contexts.

Arabic term (edited): ���� �����

Good luck