hang up the uniform 什么意思

题目

hang up the uniform 什么意思
应该是有引申义
Before signing the bill, the president said the repeal is a tribute to those he called "patriots," who were forced to hang up their uniforms because of the policy.
这是原句。
谢谢

答案

大概是：洗手不干、退出了、辞职了的意思.