Firqa refers to local militia units in Oman. The British were known for utilising Firqa during their occupation there, converting former enemies into pro-British militia to aid them in their counter-insurgency.
Firqa continued at least until recent times; as recently as 1990 the Omani government was issuing payments of 120-140 rials per month. This payment was both to maintain a pro-government paramilitary force, as well as to enable nomadic Omanis to continue living in their traditional areas.
References
Firqa (military) Wikipedia(Text) CC BY-SA