While I hate to defend the RMP, who on the 2 occations I have dealt with them, were not exactly wonderful, I don't think they actually initiate any prosecutions.
My understanding is that they investigate, and report the facts. Then someone else makes the decision to prosecute based on that investigation.
To say that pressure was put on them to prosecute is therefore wrong.
It may well be that pressure was applied to the decision making authority.
I do find it odd that there was no critisum of the Army Legal Serices or Senior Officers for bringing the case. They saw the investigation, and therefore the evidence, they could and should have called a halt to it, if it did not support the charge.