I was a naval officer, lieutenant junior grade.

我曾是名海军军官，中尉军衔。

《柯林斯英汉双解大词典》

"As acting CO of Team Blue, I am hereby granting you a field commission to the rank of Lieutenant, Junior Grade, " Kurt told Fred.

“作为蓝队的代理指挥官，我授予你一项战场委任，即刻成为初级上尉军衔，”库尔特告诉佛瑞德。

youdao

Reserve junior officers: reserve Captain, Lieutenant and Second Lieutenant.

预备役尉官：预备役上尉、中尉、少尉。

youdao

We see junior officers, captains and mid-level officers, majors and lieutenant colonels leaving the military in larger numbers than, than we would expect or that would be healthy.

NPR: U.S. Military Faces Strain in Achieving Iraq Plan