At the beginning of the rehearsal, the multi reconnaissance radar of the seventy-fourth group army of the Red Square army has been configured according to the tactical requirements, the observation whistle is arranged in various directions, the uninterrupted search of the enemys attack direction is carried out, and the reconnaissance and early warning network of the combination of the far middle and the middle school and the middle and low phase is constructed. Takeoff of a target A number of drones simulating the blue army have launched ultra low altitude penetration from different directions in the air defense positions. The ground air defense unit quickly adjusts reconnaissance and deployment, and implements precise search and tracking for incoming target relay. Soon, the target is firmly locked, the various types of artillery and portable air defense missiles are distributed in different areas and different directions. According to the threat of enemy aircraft, the multi-layer air defense fire network is formed, and the echelon interception of the target is carried out. Portable air defense missile and artillery fire Du Jie, deputy brigade commander of an air defense brigade of the seventy-fourth group army: this comprehensive exercise, relying on the favorable conditions of the training base, we set up an effective reconnaissance and early warning system and comprehensive support system, which will combine the fire resistance with the electromagnetic resistance, and fully temper the all-weather and all factor anti air combat capability of the army.