Dark Mission Insignia

Although I've read a great deal about the fantastically oblique heraldry and insignia of the purported "black world" of the U.S. military -- namely in the (recommended) work of Trevor Paglen -- I've never come across it in the flesh, er, vinyl decal. Imagine my joyful surprise at discovering a treasure trove of mission stickers, identifiers, and decals at the small-aircraft annex of the Portland International Airport this week. Apparently pilots of all stripes pass through and leave their mark. Decode at will, and read more here.