Twenty prison guards were trained in the operation of anti-drone jammer systems. The training took place at the premises of the Officers' School of the Hellenic Police by specialized officers of the National Defence General Staff (HNDGS). 

According to a relevant announcement, the advanced systems were developed and manufactured by the Research, Technological Development and Innovation Centre of the HNDGS and delivered to correctional facilities to enhance security and protection against drones. 

(File photo)