Hi 'forget'....alas my claim comes from (opens cloak) being a dot spotter in my teens and early 20s and seeing the trails dissipate in such a way (closes cloak).
Thanks Diedtrying for the Golden Knights answer...shame 'Channel 9 News' didn't research it properly before airing, but hey.
Going back to mare tangible evidence, Steve Douglass (google him) is an aviation radio nut in the US who sent his data to AW&ST magazine. One of his snippets was photos of a 'pulse contrail' (though I'd beg to differ) seen whilst monitoring the exotically callsigned DARKSTAR MIKE....which, alas, was/is an E-3 out of Tinker AFB.