Conversation so far:
who is designated survivor at state of unions
In the United States, a designated survivor is a named individual in the presidential line of succession, chosen to stay away from events such as State of the Union addresses.
What is the purpose of the role of designated survivor at state of union
A designated survivor is chosen in the event multiple officials in the presidential line of succession died in a mass-casualty incident. The surviving official would become acting president.

Question: When was the most recent one chosen
Self-contained rewrite: When was the most recent designated survivor chosen in the state of union