A brief description of the manga I Was Invited to Join the Country as an Otherworldly Warrior, but I Refused and Decided to Start as a Soldier:
Totsuka Yukikazu was a student in the peaceful Japan, when suddenly during class break, he and his classmates were caught up in a summoning to another world. In the otherworld he got offered a position as an otherworldly warrior that would fight for the kingdom or the choice to take his freedom and walk his own path. With a mysterious voice in his head that told him to abandon the castle life, he decided to take his own path and become an adventurer!
… After he finishes his 2 year mandatory military service
Mangapark seems to have this up to chapter 125, but even that hasn’t updated in several years.
So…instead of being an otherworldly warrior, he decided to be a different type of warrior but, in the military. How tf does that make sense exactly 
. I know there is a lot of differences between the two occupations, but he’s…still a warrior during his two years mandatory military service 
.
this looks dropped
Chapter 11 and 12 are the same. Did they forget to upload the correct chapter 12 or something?
Nice story but there’s at least 3 double chapter posts, so in truth rather than 12 chapters there’s only 9.
Cancel that previous comment. After chapter 11 it switches to a different story. Don’t know what is up with that.