Somebody has to account for the cost of that missile and the conditions of its launch. You can’t hide something that big.
It’s likely an interceptor. Very high altitude judging by how long the engine fired. Target was probably orbital.
It’s all a guess, but this indicates there is a low intensity war on. They don’t test out of Whidbey. I live right next door. They fly jammers out of there primarily, ECW stuff. Bremerton has the sub base with the reinforced pens.
I’m a little surprised this was launched off of Whidbey Island and NOT of a ship somewhere near Bremerton.