首先是solder拼写有误,应该是soldier.另外,what do you do when you were one soldier.正确的写法应该是what did you do when you were a soldier/what do you do when you are a soldier.
前者因为都是过去式了,所以不能用do.
后者因为你只是疑问,所以用do还有were变成are.