This paper model is a Wedge-shaped Vessel (the Wedge type aka a Defender type), a support vessel in service with the Colonial Fleet by the tenth year of the First Cylon War, based on the American military sci-fi television series Battlestar Galactica, the papercraft was created by Steve.
During the First Cylon War, one of these ships is reported destroyed by Cylon forces, and hidden away within Cylon controlled space. This is a ruse created by the Colonial Fleet in order to hide away a large amount of units in preparation for an offensive against Cylons targets.
After the Fall of the Colonies, two of these ships escape with Galactica, though it is unknown if they share the same military role, as Galactica is initially the only known military vessel to have survived the attacks, and these ships do not participate in any post exodus engagements with the Cylons. [Source: BS Wiki]
You can download this papercraft model template here: Battlestar Galactica - Wedge-shaped Vessel (Defender) Free Paper Model Download