Harm and Mac are sent to Iron Forge Military Academy to assist its Commandant, a retired Navy JAG officer in conducting a mock trial. The "case" they are trying is a gun turret explosion on a battleship, that killed many sailors. A deceased Seaman was held responsible, as he had been a victim of hazing earlier, and is suspected to have sabotaged the gun in revenge. Cadets play the roles of prosecutor, defense attorney and defendant. Harm assists the cocky young cadet assigned as "prosecution". While Mac assists the female cadet assigned as "defense counsel". During the trial however, they encounter a discrepancy in what was otherwise an open and shut case, forcing Harm and Mac to reinvestigate. They uncover evidence that might exonerate the deceased sailor.
Meanwhile at JAG HQ, a TV commercial director Renee Peterson arrives to shoot an advertisement enticing people to become JAG attorneys for the Navy. Problem is, that she finds routine run of the mill work at JAG to be boring administrative work, and she can't grasp the significance of trying certain weirdly named breaches of military discipline. Then there is the fact that with a few exceptions, most people at JAG lead ordinary lives. She cannot compete with other commercials "selling" the more glamorous combat branches of the navy. She needs to find someone who leads an exciting life.
- Based on a True Story: The turret explosion is based on an actual explosion aboard the USS Iowa in 1990.
- For Want of a Nail: Greg Reardon was confronted by a different guy about him stealing his girlfriend. That other sailor did this right when the gun crew were preparing to fire the gun. Because he was distracted, he didn't catch an inexperienced ordnanceman load too many bags of gunpowder, and as a result the gun blew up.
- No Celebrities Were Harmed: Iron Forge Naval Academy is totally not Valley Forge Military Academy, the prestigious prep school in Pennsylvania.