The Swiss army’s long-running problems with a consignment of Israeli reconnaissance drones has hit another snag: the drones need reprogramming to prevent collisions with other flying obstacles, such as paragliders. + Get the most important Swiss news directly in your inbox Federal defence contractor Ruag must fix the problem with the six Hermes 900 HFE (ADS 15) drones from Israeli company Elbit, according to Swiss broadcaster SRF. A letter from the parliamentary finance committee to defense minister Viola Amherd shortly before Christmas, which Swiss public broadcaster SRF has seen, reveals doubts as to whether Ruag will really succeed in doing this. + Read more: Switzerland's dilemma of drones vs neutrality The committee criticises the "slow development" and writes that the "detect and avoid" system poses "significant risks with regard to technical feasibility, approval and costs." Without this system, "the autonomous operational suitability of the drones would be severely limited ...