The presence of JBLM south of Tacoma means that there are plenty of military helicopters operating in the Seattle area.  I got lucky late in one day when a Chinook called up on approach.  They weren’t landing at the field but just flying through.  I got a good view of it as it came in to the field.  They then turned downwind to depart providing a background view as a local JetRanger came in to land.  I am not a big fan of the sand finish used on the Chinooks these days but they do pick up the light.