The film tells the work of Soviet military experts who arrived in Vietnam in 1965.  The script is based on the memories of Soviet missile officers who were called in to train the Vietnamese soldiers to work on the S-75 Dvina air defense systems. The prototypes of the main characters were Soviet officers Fyodor Ilinykh and Boris Mozhaev.

(Photo for illustration)

The systems, used during the war in Vietnam, were capable of helping against single targets and clusters, and low-flying and high-speed targets. They were also used to suppress the operation of anti-radar missiles such as Shrike.

Veterans of the air defense forces who participated in the military operations of the Soviet Union also attended the film-making team. At the academy, filmmakers shot instructional videos to assist participants in the filming process for later production.

Source: VNA