It doesn't matter how great some weapons seem on paper - sometimes, stuff just happens and even the coolest, most badass weapons end up relegated to the White Elephant chapter of history. Often times, these weapons that never saw action get caught up in political quagmire, or show up in the wrong place at the wrong time, with no war to fight.
Other times, in the greatest stroke of irony, some of the weapons that never saw action were just too great for their own good. Too big, too powerful, too expensive or just too over-the-top to prove practical in battle. But no matter what ultimately kept them off of the battlefield (including peace), it's hard for military hardware enthusiasts to not feel a little pang of regret at the idea of these great machines winding up in mothballs.
Vote up the coolest weapons that never saw action below, and be sure to let us know what you think in the comment section.