In the East German CounterIntelligence Agency, there is Department 5 (D5) also known as Special Section. In Thuringia, near Dresden, they are in charge of counterintelligence involving foreigners residing in Bautzen where they have a Prison for transient foreign nationals.
Maybe transient because once they are no longer of use for counterintel, they are moved onward.
Here's something that might be useful in a prison…
TRUE BLUE D5
OVERVIEW
Where a lightweight Fresnel spotlight using daylight characteristics with compact size and high efficiency are needed, ARRI TRUE BLUE D-Series Fresnels are the preferred choice. ARRI's elegant modular construction, using corrosion-resistant aluminium extrusions and lightweight die castings, offers great structural strength and weather resistance. Together with ARRI flicker-free Electronic Ballasts, the rugged TRUE BLUE D-Series is ideal for all types of location lighting.
Guess where it is made… see PDF attached
Investigations into Abu Ghraib used photographs with reference numbers like C5-21, D5-11, M65-69.