As a Navy clinical psychologist assigned to a Marine operational unit , I was authorized to wear their uniform . The corporal rolled forward in his wheelchair and shook my hand firmly . " You have no idea how great it is to see that uniform , ma'am , " he said with a grin .

Question: Why did the corporal grin ?
Answer: He thought a woman in uniform was funny .He appreciated seeing the familiar uniform again .None of the above choices .He and the woman shared a joke .