Assertion: banshee's attack | /r/HasProperty | commissioned throughout the covenant's history
Facets:
value: for the covenant's oceanic installations
type: PURPOSE
value: during deep-sea artifact retrieval
type: TEMPORAL
Source sentences:
text: Amphibious attack and escort Banshee variants were commissioned throughout the Covenant's history for the Covenant's oceanic installations and during deep-sea artifact retrieval missions, although they have rarely been encountered by the UNSC.