The American arsenal.?

If we used stealth helicopters in the assassination of Osama, then what other secrets could the pentagon be hiding? Are rail guns already aboard American Cruisers and Destroyers? Do we already have a hypersonic stealth cruise missile that if necessary can be mass-produced in a short time if need be to say take on Chinese defenses? Might we already have an answer to that pesky Chinese anti-ship ballistic missile? Maybe the US experimented with such missiles in the past and actually we have blueprint to make them on Mass if necessary. This question is just for fun, but serious answers are much more welcome. Maybe some here know of strange or powerful weapons, or rumors that the US MIGHT have employed... I'm not saying they have I'm saying there might be something interesting out there that might be plausible in the future.