[Nomentatus]

But it's interesting that two countries at loggerheads - Russia and the US - are both agreeing to keep some US special weapons secret. I'm thinking of anti-aircraft lasers according to an IEEE article. Russia because it would be embarrassing to admit it's technologically being skunked; and the US... because they want to beat the Russians, not embarrass them?

Iran (and Russia) loves to brag about half-baked new military tech, out of sheer narcissism. The US, as you suggest is historically much better at hiding its hand and springing surprises when war comes.