army grade

例句：

1. 1. The officer was promoted to the army grade of major.
   这位军官被晋升为少校。
2. 2. He achieved the army grade of sergeant first class.
   他获得了士官一级的军衔。
3. 3. The new recruits were assigned to the army grade of private first class.
   新兵被分配到下士一等兵的级别。