Civilian Labor Group or CLG are organisations of German or other European nationals employed by the US Army in Europe. They often wear American fatigues or a blue uniform with various insignia identifying them as CLG members.
History
The Labor Service Units were created during to support Berlin Airlift of 1948-1949. With the creation of the Bundeswehr in 1955, the Labor Service Units were renamed Civilian Labor Groups. The units performed a variety of functions such as Signals, Construction, Bridging, and Security. One CLG was assigned to the US Army's 565th Engineer Battalion.
References
Civilian Labor Group Wikipedia(Text) CC BY-SA