Whats is the mean of "black-cad"?
The complete phrase is:

Pining medals on soldiers and black-cad members of the Iraqi Counter-Terrorism-Service

From The Economist: December 17 th 2016Sorry.
"Pinning medals on soldiers and black-clad...."

Question

Whats is the mean of "black-cad"?
The complete phrase is:

Pining medals on soldiers and black-cad members of the Iraqi Counter-Terrorism-Service

From The Economist: December 17 th 2016Sorry. 
"Pinning medals on soldiers and black-clad...."

Answer

Are you sure it wasn't "black-clad"?
That would mean that they were dressed in black

Answer

I'm sure you meant "black-clad" which means they're wearing black clothing.

Answer

Yes, the original is here:
http://www.economist.com/news/united-states/21711884-our-columnist-travels-americas-outgoing-defence-secretary-afghanistan-and-iraq
and it is "black-clad" and it means "dressed in black clothing."

Also, the first word is "pinning," with two n's. "Pining" is actually a completely different word with a different pronunciation. Medals fasten to clothing with a sharp pin in the back, and "pinning" a medal means "attaching the medal to somebody's clothing."