The STN T-12 Viper is a plane in Just Cause Unity.


The Viper is a fifth-generation multi-role fighter jet designed by STN in 2013 as part of the Air Superiority Program, which was STN's first attempt at a multi-role fighter. Millions of dollars were poured into the project, resulting in the STN T-12 Viper. Unfortunately, the project flopped and was only bought by the military forces of smaller countries as well as the Moroccan Military.


One of the best, it is very good for dogfights and bombing runs, it is the third fastest plane in the game, being beaten by the CS8 Lightninghawk and the HMAS Buzzard, respectively.


  • It is produced by the STN company.