Islamic State Special Intelligence Unit (SIU)

Bottom row, first from left is keeping eye on aircraft in the sky.

used for counter espionage 

2 colonels, 1 Major and other Sunni Iraqi Army officer who converted to IS but kept "spying 4 'Baghdad' executed  

#عاجلصور للشبكة التي تصفيتها من قبل القوة الأمنية الخاصة @EjmAlraihttp://t.co/EdtY5G7zQU #ولاية_صلاح_الدين pic.twitter.com/4gytgqLeyc
— أحمد العربي بعد حذف (@Ahmad_alarabi11) January 5, 2015

#IslamicState | photos of #IS 'security forces' executing 8 people allegedly Iraqi police & 'spies ' in #Iraq pic.twitter.com/D0MaVO0ZHI
— H e b a (@HK2307) January 5, 2015

RT @EjmAlrai 2 col, a Major & other Sunni #Iraqi #ISF who converted to #IS but kept "spying 4 'Baghdad' executed pic.twitter.com/lj1u93yoef
— H e b a (@HK2307) January 5, 2015