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.
One of these is similar to a group on the PBS show Carrier
http://www.pbs.org/weta/carrier/air_wing_11.htm