“退伍”常见的英文表达是 “be discharged from the military” 或 “leave the military” ，也可用 “retire from the armed forces” （侧重于因达到一定服役年限等原因正常退役） 。具体示例如下：
be discharged from the military：
He was discharged from the military last year.（他去年退伍了。）
leave the military：
After serving for ten years, he decided to leave the military.（服役十年后，他决定退伍。）
retire from the armed forces：
My grandfather retired from the armed forces at the age of 55.（我爷爷55岁时从武装部队退伍了 。）