他在18岁时被征召入伍服兵役。

He was drafted into ___military service at the age of 18.

他完成了两年的兵役后就回到了大学。

He returned to college after completing two years of ___military service.

他完成兵役后回到了大学继续学业。

He returned to university to continue his studies after completing his ___military service.