Exactly right Flyer. Both of these projects worked as predicted, the science was solid. The OTH radar was not needed because we had other ways to intercept incoming missiles or bombers. The ULF radio station worked but the wavelength of the transmitter was so long that it took forever to transmit a single word. But sure enough the subs could hear it worldwide.
Now, who says we didnt build some odd system called HARP, which we most assuredly did, and what was it for? Contrails are a difficult one to quantify, but why would it be odd if they did do it?