Arkonian military vessel
From Memory Alpha, the free Star Trek reference
An Arkonian military vessel was a type of destroyer utilized by the Arkonian military during the mid-22nd century.
Enterprise encountered one of these vessels after inadvertently traveling into Akronian space in 2152. (ENT: "Dawn")
This vessel was referred to by the production staff as an "Arkonian destroyer". For more information on this studio model, see ENT studio models.
