Here are my corrections:
My latest experience in taking leadership was during military service. I was serviced as infantry in the GOP, which is the closest place to North Korea. It was a dangerous place, so we usually kept a gun loaded with real bullets and stayed within the DMZ (Demilitarized Zone) most of the time. In several tough situations though, I was given the of mission to taking charge of 7 subordinates as the leader of a squad. I couldn't refuse taking the position even though I really wanted to, but, in the end, I safely completed my mission without any accidents having taken place during that period of time.
Note:
"My latest leadership experience" is correct but I think it sounds more professional to say "My latest experience in taking leadership".
Maybe list some situations after this where you showed leadership while assuming control of the squad. For instance, the enemy did this and members of my squad didn't know if what we should do so I made the definite decision to do X and because of that we won a particular battle, etc.