Assertion: destroyer | /r/HasProperty | called
Facets:
value: often
type: TEMPORAL
Source sentences:
text: Once Germany adopted unrestricted submarine warfare in January 1917, destroyers were called on to escort merchant convoys.
text: Destroyers are often called upon to scout out enemy positions, provide support — either with a smoke screen or as a distraction — and/or perform precise strikes on individual targets.
text: Destroyers have been called upon to perform a wide variety of duties.