The military was too vague in their claiming that the sighting was caused by them. If it really had been them a more detailed explanation would have been given. For instance what aircraft were causing it, the number of soldiers involved, bases involved, and so on. Also, in the photo I enhanced the image and found another UFO that was not visible to the naked eye.

News states:

KIMA looked into it and found out a lot of you were also getting in touch with the UFO Center. Calls came in from Yakima, Zillah, Toppenish and Sunnyside.

We got some answers from the Yakima Training Center. The Centre says the lights were coming from some military exercises.

"There were a lot of people, the whole block was outside and lined up you know. At first everyone was like, kind of had the same reaction, 'oh no way it's this, that'", said JR who watched the whole event.

The Yakima Training Center says the lights were either coming from illumination rounds or military beacons that can reflect light when it's foggy. - KIMA