An Arkonian military vessel was a type of military vessel utilized by the Arkonian military during the mid-22nd century.
Enterprise NX-01 encountered one of these vessels after inadvertently traveling into Akronian space in 2152. (ENT: "Dawn")
This vessel was referred to by the production staff (for example, in the script) as an "Arkonian destroyer", despite being referred to as an "Arkonian military vessel" on screen.
In the final draft script of "Dawn", this craft was referred to thus; "Although we've never seen this type of ship before, it should be reminiscent of [an Arkonian patrol ship