 Before that, on June 18, it was confirmed that UAE military had deployed several of its Pantsir S-1 air-defence systems to western Libya, which were filmed on that day near the pro-LNA Al Jufra air force base, probably to increase the anti-aircraft defences of the pro-LNA forces against the pro-GNA aircraft and the increasing presence of Turkish military UCAVs.Both pro-GNA and pro-LNA air forces suffer serious lack of qualified air force personnel, especially the pro-GNA Libyan air force — most of their pilots are over 50 years old, well above air-force retirement age, and very few have high-quality flight skills.Because of that, and due to many of its Libyan-born pilots and air force personnel being killed in the war, both sides, especially pro-GNA air forces, are relying more and more on foreign mercenaries to both fly and repair their fighter jets, with mixed results.