Portable Aircraft Arrestor Gear
Airpolice
The equipment fitted is probably a Portable Aircraft Arrestor Gear (PAAG) not a Rotary Hydraulic Arrestor Gear (RHAG). If so, it will have been installed, along with the Rapid Erect Shelters (RES), by 5001 Sqn "at no cost". There is a budget for the maintenance of the deployable facilities stockpile - sometimes end users are required to pay, sometimes they are not - usually they pay for post-use maintenance and return to storage.