This info came from Roger Smart -
When I was serving with 25 Squadron in Paderborn which was part of 4th Divisional Engineers in 1967 I was seconded to a new unit, an Air Troop which was formed consisting of two Sioux Light Observational Helicopters and support vehicles. There were just eight personnel, two pilots both RE an officer and S/Sgt. The remaining personnel were a Cpl and two Sappers, (I was one of those Sappers) and three REME aircraft techs two L/Cpls and a WO2. We were stationed in Sennelager and provided aerial observational support for 4 Div Engineers and 20 Armoured Brigade Group.