It was first used to intercept USAF UAVs flown from Vietnam and other south east Asian countries to mainland China .
In 1967 , China successfully completed locally produced K - 13 ( PL - 2 ) missile tests , and start to deploy this missile to combat units .
China was first used to intercept USAF UAVs flown from Vietnam and other south east Asian countries to mainland China .
In 1967 , China successfully completed locally produced K - 13 ( PL - 2 ) missile tests , and start to deploy this missile to combat units .