英文笑话：Put that ring back on

During World War II, I found that my wedding ring was being destroyed through the use of my GI trenching（挖沟） shovel（铁铲） , so I took the ring off and placed it on my dog-tag chain.

After being promoted from corporal（下士） to staff sergeant（中士） , I sent my wife a photo of myself wearing the new stripes¹. Instead of congratulations the letter I got back contained just five words: "PUT THAT RING BACK ON!"