If you mess up just one glorious time in the U.S. military, your friends and peers will never let you forget it. It's always been this way, even in World War II. From November 1943 until she was lost in 1945, the destroyer USS William D. Porter was greeted by home ports and other U.S. Navy ships with: "Don't shoot, we're Republicans!" That's what happens when you almost assassinate the president.
In 1943, the USS Iowa was ferrying President Franklin Delano Roosevelt and U.S. Secretary of State Cordell Hull, along with the top brass of the entire United States military in the middle of the biggest, most dangerous war ever. It was a very special, important mission. They were on their way to meet their Allied counterparts in Cairo and Tehran, including British Prime Minister Winston Churchill and Soviet Premier Joseph Stalin.
The whole thing was almost derailed by one torpedo fired at the Iowa, by a destroyer in the Iowa's own convoy, the William D. Porter. And it was a fast-running, powerful 500-pound torpedo.
The Porter was a hard-luck ship that hadn't even seen combat yet. As she left Norfolk, she scraped the side of her sister ship, almost tearing her apart. While on convoy duty crossing the Atlantic, one of her depth charges slipped out of its hold and detonated, sending the convoy into a tizzy. Later, a large wave washed everything on the destroyer's deck into the ocean, including a sailor that was never found. Once things calmed down a bit, the crews settled in for some target practice as the President watched on.
The Iowa launched target balloons, which the ships fired at in turn, including the Porter. Next, the skipper of the Porter ordered torpedo practice with Iowa as the target. But when the simulated order to fire a torpedo accidentally launched an armed torpedo, the bridge understandably flipped out.
Under strict radio silence to avoid attracting German u-boats, the crew of the Porter began to furiously signal Iowa. Unfortunately, in their haste, they mentioned nothing about a torpedo, instead telling the battleship that the destroyer was backing up at full speed. Eventually, they radioed the Iowa anyway. After a brief disagreement about radio procedures, the huge battleship moved out of the way of the oncoming torpedo, which exploded in the wake of the battleship, with President Roosevelt aware of the torpedo and watching it come.
The guns of the battleship turned on the William D. Porter. The ship was ordered to make its way to Bermuda, its entire ship's company under arrest. It was surrounded by U.S. Marines when it arrived in Bermuda. The crew was dismissed to landward assignments, and its skipper was sentenced to 14 years in prison – a sentence President Roosevelt commuted to no punishment because he considered it an averted accident.
The destroyer itself would go on fighting the war while continuing its hard luck, accidentally shooting down American planes and strafing her sister ship with gunfire. In June 1945, a Japanese kamikaze pilot who missed his initial target sank into the sea next to the Porter. It exploded directly underneath the ship, however, and sent her to the bottom.