To combat the heavily armed gang related violence that had begun infesting cities, new patrol drones were deployed. The tri nemu class jet engines, produce a distinct whirling sound that is similar to an owl, earning it the nickname Strigiformes. Dual auto-cannons, allows the Strigiformes to take down the makeshift power armour the gangs had been employing.
Based on Concepts created by Joe Lesaffre
https://www.artstation.com/artwork/L3AOA
https://www.artstation.com/artwork/Qr1K4