That's what I have seen whenever they launch them to shoot them down with interceptors from Vandenberg. Also the contrails stay in the sky (stratosphere) pretty much forever until it gets dark. They don't dissipate.
The world should have noticed by now that claims of Bigfoot and Chupacabras and UFOs have steadily declined since the time when practically every person on the planet now has a HD-capable video camera on their $49.99 cell phone.
... Or, Freepers can just fly off the handle insisting that a Chinese or Iranian SSBN submarine brazenly launched an ICBM just a short distance from Catalina Island.
Hasn't anyone learned from the 'Balloon Boy' hysteria that the live TV news video of the homemade silver mylar balloon they were watching was five feet in diameter and totally incapable of carrying a little boy? On the live video, it seemed like the balloon was bigger than the Goodyear blimp, right up until it crashed into a plowed wheatfield and was grabbed single-handedly by a sheriff's deputy which not only revealed it's true size, but that the ballon couldn't have even carried a can of soup into the sky.