Why December 1997 is a pitiful month

Those who enlisted up until December '97
were the "visitation generation" at boot camp
where you could get visits for a few hours
But from the January '98 enlistees, they were the "100-day leave generation"
I was so incredibly envious
By the time I finished advanced training and arrived at my unit, the January enlistees were already there
And that guy got his leave before me ㅜㅡㅜ
It felt like my guts were twisting
Back then, it was a time when reservists (Sang-geun) would serve a year at their units
I was a senior, and I remember thinking, "I wish this guy would just get the hell out of here already" haha