MTS Seagull's military pack 1.2.1 is a release file of the Minecraft mod Immersive Vehicules - Trin Military Pack, made for Minecraft 1.12.2. It was published on October 30, 2018 and is 3 MB in size. For the full description, screenshots and every other version, visit the Immersive Vehicules - Trin Military Pack mod page.
How to install: Put the .jar into the mods folder (.minecraft/mods) and start Minecraft with the matching mod loader profile.