Diana Toebbe, the wife of a US Navy nuclear engineer who earlier this week pleaded guilty in a scheme to sell US naval secrets to a foreign country, pleaded guilty Friday in a federal courtroom in Martinsburg, West Virginia.Diana Toebbe, the wife of a US Navy nuclear engineer who earlier this week pleaded guilty in a scheme to sell US naval secrets to a foreign country, pleaded guilty Friday in a federal courtroom in Martinsburg, West Virginia.