Where is the license plate 'Shaanxi S' from?

[Clifford]

Shaanxi S is the license plate for the Shaanxi Military District. The license plate codes for various regions in Shaanxi Province are as follows: Shaanxi A is for Xi'an, Shaanxi B is for Tongchuan, Shaanxi C is for Baoji, Shaanxi D is for Xianyang, Shaanxi E is for Weinan, Shaanxi F is for Hanzhong, Shaanxi G is for Ankang, Shaanxi H is for Shangluo, Shaanxi J is for Yan'an, Shaanxi K is for Yulin, and Shaanxi V is for Yangling Agricultural Hi-Tech Industries Demonstration Zone. The functions of license plates are: 1. To number and register information for each vehicle; 2. To identify the region to which the vehicle belongs; 3. To trace the owner and registration information of the vehicle based on the license plate. Types of license plates: 1. White represents military and police plates; 2. Blue represents ordinary small vehicles with fewer than 7 seats; 3. Yellow represents ordinary large vehicles; 4. Black represents foreign enterprise plates.