I may be wrong but I think that there is another big difference between an Article 32 procedure and a Grand Jury. I am not an expert on the law and the rules may vary from state to state and to the Feds but I thought that a Grand Jury consists of 24 persons who decide whether to proceed or not. How many sit on an Article 32 hearing?
See post #1
It details some of the other differences. The 4th paragraph lists a "body of jurors" for the Grand Jury, but it doesn't say how many.
As I read it, there is only one (1) article 32 investigation officer who forwards his report to higher for decision.