The "Skipjack"s saw service during the Vietnam War and most of the Cold War.

Entity and relation annotations:
id: 0
type: entity
value: text: the Cold War
labels: <Event>
id: 1
type: entity
value: text: the Vietnam War
labels: <Event>
id: 2
type: entity
value: text: during the Vietnam War
labels: <Date>
id: 3
type: entity
value: text: The "Skipjack"s
labels: <Production>