Based on the context and the answer, generate a question. 

Context: 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 .

Answer:

Because he had lost the use of his legs .



Why was the corporal seated ?