No, the fact that the try one offer would not be honoured by the military *is* certain. The only one uncertain in the entire affair was the soldier who signed on to a lying inducement. He's the only party to the deal who didn't know what he was going to (not) get.The fact that recruitment is done with a "try one" offer is irrelevant. Nothing with the military is ever certain. If that thought bothers you, you should enlist to begin with.
The army knew in advance that they would not be fulfilling the the major terms of the commitment they had just made, and the recruiter knew who he made the offer that the deal he was promising was false.
Again, if "everyone knows" the realities of military life, then the try one come-on would not exist. It's only in place because it fools people.
The cotract says "try before you commit". The reality is "you're now committed until we decide to let you go."
That's fraud, and there isn't any onther way to spin it.